CN106875880B - Common voltage compensation circuit, compensation method and display device - Google Patents
Common voltage compensation circuit, compensation method and display device Download PDFInfo
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Abstract
The invention discloses a public voltage compensation circuit, a compensation method and a display device, wherein the public voltage compensation circuit comprises: the device comprises a detection module and a compensation module; the detection module detects the fluctuation condition of the common voltage of the current display picture, and when the fluctuation value of the common voltage is determined to be larger than a preset threshold value, the enable signal is output to start the compensation module, the compensation signal of the common voltage is output, and the phenomenon of poor display is improved. The common voltage compensation circuit has strong universality, solves the poor display caused by the fluctuation of the common voltage from the source and improves the display quality; the common voltage compensation circuit is simple in structure and high in real-time performance, and power consumption of a working part of the common voltage compensation circuit under a common display picture can be omitted, so that the overall power consumption is reduced, and poor display caused by common voltage fluctuation is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a common voltage compensation circuit, a compensation method and a display device.
Background
With the development of display technology, people have higher and higher requirements on the display effect of the display panel. In the conventional display panel, display defects such as green light (greenish), crosstalk (crosstalk), flicker (flicker) and the like of a display screen still exist. The above-mentioned defects are all caused by the fact that the common voltage fluctuates sharply in some display frames and the charging of the pixels is biased in a specific polarity inversion mode of the pixel structure in the display panel. However, different product sizes, product types and pixel structures in the display panel, different display screens triggering greenish, crosstalk and flicker, and different solving or improving methods.
In the prior art, one solution is as follows: the display effect of the display panel is adjusted by compensating the common voltage, specifically, the common voltage signal and the feedback signal of the display panel are input into the compensation circuit, and after being processed by the compensation circuit, the compensated common voltage signal is input into the display panel again, so that the fluctuation of the common voltage of the display panel is weakened, and the display quality of the display panel is improved. However, this compensation method needs to detect the feedback signal of the common voltage in the display panel all the time, the compensation timing is difficult to control, and when the common voltage does not need to be compensated, the compensation circuit is always in the on state, which increases the power consumption of the display panel. Yet another solution is: and a time sequence controller (Tcon) for detecting the function of a display picture is added, and when the Tcon detects a display image with poor triggering, greenish, crosstalk and the like, the poor phenomenon is solved or improved by changing the polarity inversion mode of the pixel electrode. However, the display screens with poor triggering of different products are different, so the method needs to invite a Tcon manufacturer to design a special Tcon, and the display screens with poor triggering are difficult to predict in a new product inspection stage, so that the design specification of the Tcon cannot be given in advance, and the display defects of the display panel cannot be effectively improved.
Therefore, how to improve the poor display of the display panel is an urgent technical problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a common voltage compensation circuit, a compensation method and a display device, which are used for solving the problem of poor display of a display panel in the prior art.
The embodiment of the invention provides a public voltage compensation circuit, which comprises: the device comprises a detection module and a compensation module; wherein the content of the first and second substances,
the detection module is used for detecting the common voltage fluctuation value of the current display picture and sending an enabling signal to the compensation module when the common voltage fluctuation value is determined to exceed a preset threshold value;
the compensation module is used for outputting a common voltage compensation signal when receiving the enabling signal.
In a possible implementation manner, in the above-mentioned common voltage compensation circuit provided in an embodiment of the present invention, the compensation module is specifically configured to:
and when the enabling signal is received, calculating and outputting a common voltage compensation signal of the current display picture according to the common voltage feedback signal of the current display picture.
In a possible implementation manner, in the above-mentioned common voltage compensation circuit provided by an embodiment of the present invention, the compensation module includes: the circuit comprises a capacitor, a first resistor, a second resistor and an operational amplifier; wherein the content of the first and second substances,
one end of the capacitor is used for accessing a common voltage signal, and the other end of the capacitor is connected with one end of the first resistor;
the other end of the first resistor is connected with one end of the second resistor and the positive input end of the operational amplifier respectively;
the reverse input end of the operational amplifier is used for accessing the common voltage feedback signal, the enable end of the operational amplifier is used for accessing the enable signal output by the detection module, and the output end of the operational amplifier is used for outputting the common voltage compensation signal;
the other end of the second resistor is connected with the output end of the operational amplifier.
In a possible implementation manner, in the common voltage compensation circuit provided in an embodiment of the present invention, the detection module is a timing controller.
The embodiment of the invention provides a display device which comprises the common voltage compensation circuit provided by the embodiment of the invention.
In a possible implementation manner, in the display device provided by the embodiment of the present invention, the common voltage compensation circuit is integrated in a peripheral area of a display panel of the display device, or integrated in a driving chip bound on the display panel.
In a possible implementation manner, the display device provided in an embodiment of the present invention further includes: a front-end system;
and the front-end system is used for sending the data corresponding to the current display picture of the display panel to the detection module.
The embodiment of the present invention provides a compensation method for the common voltage compensation circuit, which includes:
detecting a common voltage fluctuation value of a current display picture, and sending an enabling signal when the common voltage fluctuation value is determined to exceed the preset threshold value;
and outputting a common voltage compensation signal when the enable signal is received.
In a possible implementation manner, in the compensation method provided by an embodiment of the present invention, when receiving the enable signal, performing common voltage compensation on the display panel specifically includes:
and when the enabling signal is received, calculating and outputting a common voltage compensation signal of the current display picture according to the common voltage feedback signal of the current display picture.
The embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a common voltage compensation circuit, a compensation method and a display device, wherein the common voltage compensation circuit comprises: the device comprises a detection module and a compensation module; the detection module is used for detecting the common voltage fluctuation value of the current display picture and sending an enabling signal to the compensation module when the common voltage fluctuation value is determined to exceed a preset threshold value; the compensation module is used for outputting a common voltage compensation signal when receiving the enabling signal. Therefore, the fluctuation condition of the common voltage of the current display picture is detected through the detection module, when the fluctuation value of the common voltage is determined to be larger than the preset threshold value, the enable signal is output to start the compensation module, the common voltage is compensated for the display panel, and the phenomenon of poor display is improved. The common voltage compensation circuit has strong universality, solves the poor display caused by the fluctuation of the common voltage from the source and improves the display quality; the common voltage compensation circuit is simple in structure and high in real-time performance, and power consumption of a working part of the common voltage compensation circuit under a common display picture can be omitted, so that the overall power consumption is reduced, and poor display caused by common voltage fluctuation is improved.
Drawings
Fig. 1 is a schematic structural diagram of a common voltage compensation circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a common voltage compensation circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating comparison of waveform signals before and after compensation of a common voltage signal according to an embodiment of the present invention;
FIGS. 4 a-4 d are schematic diagrams of common voltage signal fluctuations corresponding to different display frames according to embodiments of the present invention;
fig. 5 is a flowchart of a compensation method of a common voltage compensation circuit according to an embodiment of the present invention.
Detailed Description
The following describes specific embodiments of a common voltage compensation circuit, a compensation method, and a display device according to embodiments of the present invention in detail with reference to the accompanying drawings.
An embodiment of the present invention provides a common voltage compensation circuit, as shown in fig. 1, which may include: a detection module 01 and a compensation module 02; the detection module 01 is configured to detect a common voltage fluctuation value of a current display picture, and send an enable signal to the compensation module 02 when determining that the common voltage fluctuation value exceeds a preset threshold; the compensation module 02 is used for outputting a common voltage compensation signal when receiving the enable signal.
In the common voltage compensation circuit provided by the embodiment of the invention, the fluctuation condition of the common voltage of the current display picture is detected by the detection module, and when the fluctuation value of the common voltage is determined to be greater than the preset threshold value, the enable signal is output to start the compensation module, so that the common voltage compensation is performed on the display panel, and the phenomenon of poor display is improved. The detection module detects the display picture and analyzes the fluctuation condition of the common voltage, and when poor display occurs because the fluctuation of the common voltage is large, the common voltage in the display panel is compensated, so that the phenomenon of poor display is solved or improved. Compared with the traditional compensation circuit, the common voltage compensation circuit is more intelligent, the common voltage compensation circuit is in a closed state under a common picture, the power consumption of the part of the compensation circuit can be reduced, but when a display picture of the common voltage is pulled specially, the compensation module can be started to perform compensation to solve the problem of poor display. Meanwhile, the common voltage compensation circuit has strong universality, poor display caused by common voltage fluctuation is solved from the source, and the display quality is improved; the common voltage compensation circuit is simple in structure and high in real-time performance, and power consumption of a working part of the common voltage compensation circuit under a common display picture can be omitted, so that the overall power consumption is reduced, and poor display caused by common voltage fluctuation is improved.
In a specific implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, the compensation module is specifically configured to: and when the enabling signal is received, calculating and outputting a common voltage compensation signal of the current display picture according to the common voltage feedback signal of the current display picture. Specifically, in the common voltage compensation circuit provided in the embodiment of the present invention, the compensation module may perform compensation according to the actual common voltage feedback value of the current display picture, and compensation signals required by different display pictures have different magnitudes, so that compensation accuracy can be improved, and intelligent compensation is implemented.
In a specific implementation, in the common voltage compensation circuit provided in the embodiment of the present invention, as shown in fig. 2, the compensation module may include: a capacitor C, a first resistor R1, a second resistor R2 and an operational amplifier OP; one end of the capacitor C is used for accessing a common voltage signal Vcom _ In, and the other end of the capacitor C is connected with one end of the first resistor R1; the other end of the first resistor R1 is connected to one end of the second resistor R2 and the positive input end of the operational amplifier OP, respectively; the inverting input end of the operational amplifier OP is used for accessing a common voltage Feedback signal Vcom _ Feedback, the enable end EN is used for accessing an enable signal output by the detection module 01, and the output end Vcom OUT is used for outputting a common voltage compensation signal; the other end of the second resistor R2 is connected to the output terminal of the operational amplifier OP.
Specifically, in the common voltage compensation circuit provided in the embodiment of the present invention, as shown in fig. 2, the detection module may be implemented by a timing controller, and the display device may further include a front end system. The front-end system can send data corresponding to a current display picture Pattern of the display panel to the timing controller Tcon, the Tcon detects the Pattern to analyze fluctuation of the common voltage Vcom, once the Pattern is detected to cause the Vcom to generate severe fluctuation, a GPIO port of the Tcon can send an enabling signal (the specific enabling signal can be high level) to the Vcom compensation circuit, the Vcom compensation module is started to compensate the display panel, so that the Vcom in the display panel is kept stable, if the detected Pattern does not cause the Vcom fluctuation or the Vcom fluctuation is not large (does not exceed a preset threshold value), the enabling signal (namely, a low level signal) is not sent, the Vcom compensation module is not started, and power consumption is saved.
Specifically, as shown In fig. 2, when the Vcom compensation circuit is turned on, the common voltage signal Vcom _ In of the display panel is input to the non-inverting input terminal of the operational amplifier OP, the common voltage Feedback signal Vcom _ Feedback of the current display picture of the display panel is input to the inverting input terminal of the operational amplifier OP, and then the common voltage compensation signal of the output terminal Vcom OUT is input to the display panel after being processed by the operational amplifier OP, so as to weaken the common voltage fluctuation of the display panel itself. As shown In fig. 3, Vcom _ In fluctuates sharply, and the fluctuation of the compensation signal output by the output terminal Vcom OUT is improved significantly through the processing of the operational amplifier according to the common voltage Feedback value Vcom _ Feedback of the display panel.
Several fluctuation situations of the common voltage in the display screen are briefly described below by way of example, and are specifically shown in fig. 4a to 4 d:
as shown in FIG. 4a, the polarity signals inputted to the sub-pixels (R, G, B) corresponding to the display screen are shown in the waveform diagram on the right side of FIG. 4a, wherein the 1 st, 2 nd and 3 rd columns correspond to the first group RGB, the 4 th, 5 th and 6 th columns correspond to the second group RGB, the left side of the vertical line m represents the negative polarity, and the right side of the vertical line m represents the positive polarity. According to the polarity signals input by the sub-pixels, the polarities of the signals input by the R pixels in the first row and the G pixels in the second row are opposite, so that the polarity balance is achieved; the polarities of the signals inputted to the B pixel of the third column and the R pixel of the 4 th column cannot be balanced, thereby causing the common voltage Vcom to fluctuate as shown in fig. 4 a. Among the signals input by each sub-pixel of the first frame, the signal polarity of the B pixel of the 3 rd column is positive, the signal polarity of the R pixel of the fourth column is negative and is greater than the signal of the B pixel of the 3 rd column, therefore, the common voltage signal Vcom of the first frame fluctuates towards the direction of negative polarity; in the signals input by each sub-pixel of the second frame, the signal polarity of the B pixel of the 3 rd column is negative, and the signal polarity of the R pixel of the fourth column is positive and smaller than the signal polarity of the B pixel of the 3 rd column, so the common voltage signal Vcom of the second frame still fluctuates towards the direction of negative polarity, and the polarity of the common voltage signal Vcom keeps the fluctuation of the polarity of the previous frame due to the same signal fluctuation direction with the previous frame; similarly, the fluctuation of the signals of the third frame and the fourth frame is as shown in fig. 4a, and the fluctuation principle of the common voltage corresponding to the display frames as shown in fig. 4 b-4 d is the same, and will not be described in detail herein.
As shown in fig. 4 a-4 d, the fluctuation situation of the common voltage Vcom is different under different display screens Pattern, and under the display screens as shown in fig. 4a, 4b and 4d, the fluctuation situation of the common voltage Vcom is large, when the timing controller Tcon detects these several display screens Pattern, after analyzing the fluctuation situation of the common voltage Vcom (the Vcom fluctuation is larger than the preset threshold), an enable signal is sent to start the compensation of the common voltage Vcom, thereby improving the picture quality; in contrast, in the display screen shown in fig. 4c, the fluctuation of the common voltage Vcom is small (almost none), the timing controller Tcon does not emit the enable signal, and the Vcom compensation module is not turned on, i.e., in the case of no problem in the display screen quality, the power consumption of the common voltage Vcom compensation circuit is reduced.
Based on the same inventive concept, an embodiment of the present invention provides a display device, including the common voltage compensation circuit provided in the embodiment of the present invention. The display device comprises a display panel, any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Since the principle of the display device for solving the problems is similar to that of the common voltage compensation circuit, the implementation of the display device can be referred to the implementation of the common voltage compensation circuit, and repeated details are not repeated. The common voltage compensation circuit can be integrated in the peripheral area of the display panel of the display device, so that the integration level of the display panel is improved, and the common voltage compensation circuit can also be independently manufactured on the driving chip and then bound to the display panel, so that the compensation of the common voltage is realized.
Based on the same inventive concept, an embodiment of the present invention provides a compensation method of the common voltage compensation circuit, as shown in fig. 5, which may include:
s101, detecting a common voltage fluctuation value of a current display picture, and sending an enabling signal when the common voltage fluctuation value is determined to exceed a preset threshold value;
and S102, outputting a common voltage compensation signal when the enable signal is received.
In the compensation method provided by the embodiment of the invention, when the fluctuation condition of the common voltage of the current display picture is detected and the fluctuation value of the common voltage is determined to be larger than the preset threshold value, the enable signal is output to compensate the common voltage of the display panel, so that the phenomenon of poor display is improved; the method is simple and easy to implement, and has high real-time performance; the power consumption of the working part of the common voltage compensation circuit under a common picture can be saved, so that the overall power consumption is reduced, and the poor display caused by the fluctuation of the common voltage is improved.
In a specific implementation, in the compensation method provided in the embodiment of the present invention, step S102 may specifically include: and when the enabling signal is received, calculating and outputting a common voltage compensation signal of the current display picture according to the common voltage feedback signal of the current display picture. Specifically, in the compensation method provided by the embodiment of the present invention, compensation can be performed according to the actual common voltage feedback value of the current display picture, and compensation signals required by different display pictures have different magnitudes, so that compensation accuracy can be improved, and intelligent compensation is realized.
The embodiment of the invention provides a common voltage compensation circuit, a compensation method and a display device, wherein the common voltage compensation circuit comprises: the device comprises a detection module and a compensation module; the detection module is used for detecting the common voltage fluctuation value of the current display picture and sending an enabling signal to the compensation module when the common voltage fluctuation value is determined to exceed a preset threshold value; the compensation module is used for outputting a common voltage compensation signal when receiving the enabling signal. Therefore, the fluctuation condition of the common voltage of the current display picture is detected through the detection module, when the fluctuation value of the common voltage is determined to be larger than the preset threshold value, the enable signal is output to start the compensation module, the common voltage is compensated for the display panel, and the phenomenon of poor display is improved. The common voltage compensation circuit has strong universality, solves the poor display caused by the fluctuation of the common voltage from the source and improves the display quality; the common voltage compensation circuit is simple in structure and high in real-time performance, and power consumption of a working part of the common voltage compensation circuit under a common display picture can be omitted, so that the overall power consumption is reduced, and poor display caused by common voltage fluctuation is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A common voltage compensation circuit, comprising: the device comprises a detection module and a compensation module; wherein the content of the first and second substances,
the detection module is used for detecting the common voltage fluctuation value of the current display picture according to the data corresponding to the current display picture and sending an enabling signal to the compensation module when the common voltage fluctuation value is determined to exceed a preset threshold value;
the compensation module is used for outputting a common voltage compensation signal when receiving the enabling signal;
the compensation module is specifically configured to:
when the enabling signal is received, calculating and outputting a common voltage compensation signal of the current display picture according to a common voltage feedback signal of the current display picture;
the compensation module comprises: the circuit comprises a capacitor, a first resistor, a second resistor and an operational amplifier; wherein the content of the first and second substances,
one end of the capacitor is used for accessing a common voltage signal, and the other end of the capacitor is connected with one end of the first resistor;
the other end of the first resistor is connected with one end of the second resistor and the positive input end of the operational amplifier respectively;
the reverse input end of the operational amplifier is used for accessing the common voltage feedback signal, the enable end of the operational amplifier is used for accessing the enable signal output by the detection module, and the output end of the operational amplifier is used for outputting the common voltage compensation signal;
the other end of the second resistor is connected with the output end of the operational amplifier.
2. The common voltage compensation circuit of claim 1, wherein the detection module is a timing controller.
3. A display device, comprising: a common voltage compensation circuit as claimed in any one of claims 1-2.
4. The display device according to claim 3, wherein the common voltage compensation circuit is integrated in a peripheral region of a display panel of the display device or in a driving chip bonded on the display panel.
5. The display device of claim 4, further comprising: a front-end system;
and the front-end system is used for sending the data corresponding to the current display picture of the display panel to the detection module.
6. A compensation method of a common voltage compensation circuit according to any one of claims 1 to 2, comprising:
detecting a common voltage fluctuation value of a current display picture, and sending an enabling signal when the common voltage fluctuation value is determined to exceed the preset threshold value;
and outputting a common voltage compensation signal when the enable signal is received.
7. The compensation method of claim 6, wherein the common voltage compensation for the display panel upon receiving the enable signal comprises:
and when the enabling signal is received, calculating and outputting a common voltage compensation signal of the current display picture according to the common voltage feedback signal of the current display picture.
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| CN107591137A (en) * | 2017-09-15 | 2018-01-16 | 惠科股份有限公司 | Display device and its driving method |
| CN109920383A (en) * | 2017-12-12 | 2019-06-21 | 咸阳彩虹光电科技有限公司 | A kind of common electrode voltage compensating device and method |
| CN109509447B (en) * | 2018-12-19 | 2020-08-04 | 惠科股份有限公司 | Common voltage integrated circuit and display device |
| TWI708951B (en) * | 2019-06-14 | 2020-11-01 | 友達光電股份有限公司 | Detection circuit and display panel |
| CN112885307B (en) * | 2021-01-18 | 2022-07-12 | 深圳市华星光电半导体显示技术有限公司 | Display panel, voltage adjusting method of display panel and display device |
| CN117296006A (en) * | 2022-04-24 | 2023-12-26 | 京东方科技集团股份有限公司 | Common voltage compensation device of display panel, display panel and display equipment |
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| CN1360293A (en) * | 2000-12-16 | 2002-07-24 | 三星电子株式会社 | Panel display and drive method thereof |
| KR20140011577A (en) * | 2012-07-17 | 2014-01-29 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| CN103680392A (en) * | 2012-09-25 | 2014-03-26 | 乐金显示有限公司 | Organic light emitting display device and driving method thereof |
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| KR101132051B1 (en) * | 2010-03-11 | 2012-04-02 | 삼성모바일디스플레이주식회사 | liquid crystal display |
| CN102842280B (en) * | 2012-08-31 | 2016-03-30 | 京东方科技集团股份有限公司 | A kind of common electric voltage compensating circuit, method and liquid crystal indicator |
| KR102164798B1 (en) * | 2014-09-11 | 2020-10-13 | 삼성전자 주식회사 | Display driving circuit and display device comprising the same |
| CN104680997B (en) * | 2015-03-16 | 2017-10-17 | 京东方科技集团股份有限公司 | A kind of VCOM compensation circuits and display device |
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| CN1360293A (en) * | 2000-12-16 | 2002-07-24 | 三星电子株式会社 | Panel display and drive method thereof |
| KR20140011577A (en) * | 2012-07-17 | 2014-01-29 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| CN103680392A (en) * | 2012-09-25 | 2014-03-26 | 乐金显示有限公司 | Organic light emitting display device and driving method thereof |
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