CN112562607B - Common voltage compensation circuit for display panel, compensation method and display device - Google Patents
Common voltage compensation circuit for display panel, compensation method and display device Download PDFInfo
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- CN112562607B CN112562607B CN202011493639.XA CN202011493639A CN112562607B CN 112562607 B CN112562607 B CN 112562607B CN 202011493639 A CN202011493639 A CN 202011493639A CN 112562607 B CN112562607 B CN 112562607B
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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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
Abstract
A common voltage compensation circuit, a compensation method and a display device for a display panel are disclosed. The compensation circuit comprises a trigger module, a first voltage and a second voltage, wherein the trigger module is connected with the display panel and used for comparing the amplitude of the second voltage in the display panel with a preset threshold value, the second voltage is the voltage of the first voltage after the first voltage deflects in the display panel, and the first voltage is an initial public voltage; and the compensation module is connected with the trigger module and the display panel, and generates a third voltage according to the first voltage and the second voltage when the second voltage is greater than a preset threshold value, wherein the third voltage is a compensation voltage, a fourth voltage is generated under the action of an electric field before the third voltage enters a display area, the period of the fourth voltage is the same as that of the third voltage, and the phases of the fourth voltage and the third voltage are opposite. According to the public voltage compensation method, the third voltage is generated through the offset of the second voltage and is used for compensating the second voltage, so that the relatively stable fifth voltage is obtained, and the problem of picture flicker is reduced.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a common voltage compensation circuit, a compensation method, and a display device for a display panel.
Background
Displays, such as TFT-LCDs, are increasingly used in high performance display fields due to their small size, low power consumption, no radiation, and relatively low manufacturing cost.
The TFT-LCD is provided with a common electrode and a pixel electrode, and the electric field formed by the common electrode and the pixel electrode controls liquid crystal molecules to deflect so as to achieve the purpose of displaying different gray scale pictures. However, in the prior art, since the common electrodes are wired from two sides of the display, in the process of displaying the image by the TFT-LCD, the common voltage on the common electrodes fluctuates due to the influence of the length of the wired lines, the impedance and the like, so that the common voltage coupling is serious, and thus the deviation occurs between the deflection direction and the preset direction of the liquid crystal molecules, further the display image flickers and the like, and the display effect and the yield of the product are reduced.
Disclosure of Invention
In view of the foregoing problems, it is an object of the present invention to provide a common voltage compensation circuit for a display panel, in which a trigger module detects an offset of a second voltage to generate a third voltage to compensate the second voltage, so that a fifth voltage in a final display region is in a relatively stable state, thereby reducing a flicker problem.
According to an aspect of the present invention, there is provided a common voltage compensation circuit including: the trigger module is connected with the display panel and used for inputting a first voltage and comparing the amplitude of a second voltage in the display panel with a preset threshold, wherein the second voltage is the voltage of the first voltage after deflection in the display panel, and the first voltage is an initial common voltage; the common voltage compensation circuit for the display panel further comprises a compensation module, wherein the compensation module is connected with the trigger module and the display panel, when the second voltage is larger than a preset threshold value, a third voltage is generated according to the first voltage and the second voltage, the third voltage is a compensation voltage, a fourth voltage is generated under the action of an electric field before the third voltage enters a display area, the period of the fourth voltage is the same as that of the third voltage, and the phases of the fourth voltage and the third voltage are opposite.
Optionally, the third voltage has the same period and the same phase as the second voltage, and the amplitude of the third voltage is smaller than the amplitude of the second voltage.
Optionally, the final voltage of the display panel is a fifth voltage obtained by superimposing the fourth voltage and the second voltage.
Optionally, the compensation module comprises: a first input terminal connected to the first voltage to receive the first voltage; the second input end is connected with the trigger module to receive the second voltage; and the output end is connected with the display area to output the third voltage.
Optionally, the compensation module comprises: a control end of the fifth switching tube is connected with the first input end, and a second end of the fifth switching tube is grounded; the seventh resistor is connected with the control end and the second end of the fifth switching tube; a control end of the fourth switching tube is connected with a first end of the fifth switching tube; a first end of the first switching tube is connected with a second end of the fourth switching tube, and a second end of the first switching tube is connected with a second end of the fifth switching tube; the control end of the second switching tube is connected with the second input end, and the second end of the second switching tube is connected with the second end of the fifth switching tube; a control end of the third switching tube is connected with the first end of the second switching tube, and a second end of the third switching tube is connected with the control end of the first switching tube; a control end of the sixth switching tube is connected with a control end of the first switching tube, a first end of the sixth switching tube is connected with a second end of the third switching tube, and a second end of the sixth switching tube is connected with a second end of the fifth switching tube; the eighth resistor is connected with the control end and the second end of the second switching tube; a ninth resistor connected to the second input terminal and the output terminal; a control end of the seventh switching tube is connected with the first end of the first switching tube, and a second end of the seventh switching tube is connected with the second end of the fifth switching tube; a control end of the ninth switching tube is connected with a first end of the seventh switching tube, and the first end is connected with the output end; the control end of the eighth switching tube is connected with the second end of the ninth switching tube, the first end of the eighth switching tube is connected with the first end of the ninth switching tube, and the second end of the eighth switching tube is connected with the second end of the fifth switching tube; a tenth switching tube, wherein a control end and a first end of the tenth switching tube are connected with a power supply end, and a second end of the tenth switching tube is connected with the output end; the first end of the fourth switching tube is connected with the output end through the sixth resistor; two ends of the fourth resistor and the fifth resistor are connected with the first end of the third switching tube and the first end of the fourth switching tube respectively; the anode of the first diode is connected with the control end of the ninth switching tube, and the cathode of the second diode is connected with the control end of the tenth switching tube; the first resistor and the second capacitor are connected in series, the first resistor is further connected with the first end of the fourth switching tube, and the second capacitor is further connected with the output end; the second resistor and the third resistor are connected in series, the second resistor is further connected with the first end of the third switching tube, and the third resistor is further connected with the control end of the tenth switching tube; and one end of the first capacitor is connected with the connecting end of the second resistor and the third resistor, and the other end of the first capacitor is grounded.
According to another aspect of the present invention, there is provided a common voltage compensation method including: detecting the amplitude of a second voltage of the display panel and comparing the amplitude with a preset threshold, wherein the second voltage is the voltage of the first voltage after the first voltage deflects in the display panel, and the first voltage is an initial common voltage; when the amplitude of the second voltage is larger than the preset threshold, acquiring the second voltage, and generating a third voltage according to the first voltage and the second voltage; and inputting the third voltage into the display area, wherein the third voltage is a compensation voltage, and before the third voltage enters the display area, a fourth voltage is generated under the action of an electric field, and the fourth voltage has the same period and opposite phase with the third voltage.
Optionally, the detecting the amplitude of the second voltage of the display panel further includes detecting whether amplitude jump of the second voltage has periodicity.
Optionally, the third voltage has the same period and the same phase as the second voltage, and the amplitude of the third voltage is smaller than the amplitude of the second voltage.
Optionally, the final common voltage of the display panel is a fifth voltage obtained by superimposing the fourth voltage and the second voltage.
According to still another aspect of the present invention, a display device is provided, wherein the common voltage compensation circuit is included.
According to the public voltage compensation method and the public voltage compensation circuit, whether the second voltage of the display panel deviates or not is detected, the third voltage is generated according to the second voltage deviating in the display panel, the third voltage is the compensation voltage, the deviation amount of the second voltage which originally deviates is reduced, the fifth voltage which is stable is obtained, and therefore the problems that pictures flicker and the like caused by deviation of the second voltage are solved.
According to the public voltage compensation method and the public voltage compensation circuit, the phase of the third voltage is the same as that of the second voltage, but after the third voltage enters the display panel, a fourth voltage opposite to the third voltage is generated under the action of an electric field, and therefore the fourth voltage and the second voltage are superposed to generate a relatively stable fifth voltage. The third voltage is inverted according to the action of the electric field, so that devices for inverting the third voltage are saved, and the cost is reduced.
According to the public voltage compensation method and the compensation circuit, when whether the second voltage of the display panel deviates or not is detected, the judged standard comprises whether amplitude jump is periodic or not and whether the jump amplitude is larger than a preset threshold or not, the third voltage is generated for compensation only after the standard is met, and the compensation voltage is not generated if the standard is not met. The method for determining whether to generate the compensation voltage according to the offset result of the second voltage ensures that the common voltage of the final display panel is always in a relatively stable state, thereby reducing the problem of picture flicker.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a prior art common voltage circuit for a display panel;
FIG. 2 is a schematic diagram of a common voltage compensation circuit according to an embodiment of the present invention;
FIGS. 3a and 3b show a schematic diagram of a common voltage compensation circuit of an embodiment of the present invention;
FIG. 4 shows a circuit diagram of a compensation module of the common voltage compensation circuit of an embodiment of the present invention;
FIG. 5 illustrates a waveform diagram of a common voltage compensation circuit of an embodiment of the present invention;
fig. 6 shows a flowchart of a common voltage compensation method of an embodiment of the present invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. In addition, certain well known components may not be shown. For simplicity, the semiconductor structure obtained after several steps can be described in one figure.
It will be understood that when a layer or region is referred to as being "on" or "over" another layer or region in describing the structure of the device, it can be directly on the other layer or region or intervening layers or regions may also be present. And, if the device is turned over, that layer, region, or regions would be "under" or "beneath" another layer, region, or regions.
If for the purpose of describing the situation directly above another layer, another area, the expression "directly above … …" or "above and adjacent to … …" will be used herein.
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
Fig. 1 shows a schematic diagram of a structure of a display panel common voltage circuit in the prior art.
Referring to fig. 1, the display device 100 includes a display panel 110, a display region 120 located within the display panel 110, and a common voltage wire 130 located within the display panel 110 and outside the display region 120. In a 127 gray scale image, after the common voltage Vcom is adjusted to be the best, when the image is switched to another image, for example, a pure gray scale 127(L127) image, the display area 120 has a problem of image Flicker (Flicker), and the occurrence probability is 100%. The common voltage Vcom is measured, and it can be found that the waveform of the common voltage Vcom is shifted along with the waveform of the Source voltage when the picture is heavily loaded. This is because the common voltage Vcom is easily affected by noise interference, which causes the problem that the common voltage Vcom is unstable and the image is easily flickered.
FIG. 2 is a schematic diagram of a common voltage compensation circuit according to an embodiment of the present invention; fig. 3a and 3b show a schematic diagram of a common voltage compensation circuit of an embodiment of the present invention.
Referring to fig. 2, in the display device 200 of the present application, a compensation circuit 240 is added to the common voltage conductive line 130, an input of the compensation circuit 240 is a first voltage DC _ Vcom, an output includes a second voltage TFT _ Vcom and a third voltage CF _ Vcom, and the conductive line 230 is used for outputting the third voltage CF _ Vcom, since the third voltage CF _ Vcom is output according to a magnitude transition condition of the second voltage TFT _ Vcom, the third voltage CF _ Vcom is output only when the magnitude transition of the second voltage TFT _ Vcom exceeds a preset threshold.
Referring to fig. 3a and 3b, the compensation circuit 240 includes a trigger module 241 and a compensation module 242.
The trigger module 241 is configured to detect a normal frame and a heavy-load frame of the display panel 110 in real time, specifically detect a second voltage TFT _ Vcom in the display panel 110, trigger a compensation mechanism if an amplitude of the second voltage TFT _ Vcom periodically jumps and the jumped amplitude exceeds a preset threshold, at this time, the trigger module 241 collects the second voltage TFT _ Vcom, otherwise, it is considered that the output of the second voltage TFT _ Vcom is stable, and the trigger module 241 is only configured to detect the second voltage TFT _ Vcom in real time.
In one embodiment, the trigger module 241 includes, for example, a comparator for comparing the amplitude of the second voltage TFT _ Vcom with a preset threshold. Common chips in the comparator model include LM324, LM358, uA741, TL081\2\3\4, OP07, OP27, etc., which can be used as voltage comparators of the trigger module 241. Professional voltage comparators such as LM339, LM393, etc. may also be preferably employed as the voltage comparators of the trigger module 241.
The compensation module 242 is connected to the trigger module 241, and is configured to receive the second voltage TFT _ Vcom collected by the trigger module 241, and generate a third voltage CF _ Vcom according to the first voltage DC _ Vcom and the second voltage TFT _ Vcom, where the third voltage CF _ Vcom is a compensation voltage. The third voltage CF _ Vcom is, for example, a difference value of the first voltage DC _ Vcom and the second voltage TFT _ Vcom.
In this embodiment, after the third voltage CF _ Vcom generated by the compensation module 242 enters the display panel 110, the phase of the third voltage CF _ Vcom is changed under the action of the electric field, and a fourth voltage feedback _ Vcom opposite to the phase of the third voltage CF _ Vcom is generated, and the fifth voltage final _ Vcom obtained by superimposing the fourth voltage feedback _ Vcom and the second voltage TFT _ Vcom is a relatively stable voltage.
In one embodiment, the compensation module 242 includes a subtractor for obtaining the third voltage CF _ Vcom according to the first voltage DC _ Vcom and the second voltage TFT _ Vcom, wherein a common chip in the subtractor includes 74LS183, 74LS283, and the like.
In this embodiment, the specific compensation method of the compensation circuit 240 is as follows: after the first voltage DC _ Vcom enters the display panel 110, the first voltage DC _ Vcom is deflected due to the interference of the traces and the impedance, so that the actual pixel voltage applied to the display panel 110 is the second voltage TFT _ Vcom, the trigger module 241 is configured to detect the second voltage TFT _ Vcom, and trigger the compensation mechanism when the detected waveform of the second voltage TFT _ Vcom has a periodic amplitude jump and the jump exceeds a preset threshold, at this time, the trigger module 241 collects the second voltage TFT _ Vcom and inputs the second voltage TFT _ Vcom into the compensation module 242, the compensation module 242 outputs the third voltage CF _ Vcom according to the first voltage DC _ Vcom and the second voltage TFT _ Vcom, the third voltage CF _ Vcom has the same period and the same phase as the second voltage TFT _ Vcom, but the amplitude of the third voltage CF _ Vcom is smaller than the amplitude of the second voltage TFT _ Vcom, the third voltage CF _ Vcom enters the display panel 110, and because the electric field in the display panel 110 acts to generate the fourth voltage feedback _ Vcom, the period of the fourth voltage feedback _ Vcom is the same as that of the third voltage CF _ Vcom, the phase is opposite, and the amplitude is the same, that is, the period of the fourth voltage feedback _ Vcom is the same as that of the third voltage CF _ Vcom, and the phase is opposite, and the amplitude of the fourth voltage feedback _ Vcom is smaller than that of the second voltage TFT _ Vcom, because the fourth voltage feedback _ Vcom interacts with the second voltage TFT _ Vcom, the fifth voltage final _ Vcom finally applied to the pixel is a relatively stable voltage waveform, so that the stability of the final common voltage is improved, the problem of image flicker is reduced, and the product competitiveness is improved.
FIG. 4 shows a circuit diagram of a compensation module of the common voltage compensation circuit of an embodiment of the present invention; fig. 5 shows a waveform diagram of a common voltage compensation circuit of an embodiment of the present invention.
Referring to fig. 4, the compensation module 242 includes 10 switching transistors Q1-Q10, 9 resistors R1-R9, two capacitors C1 and C2, and two diodes D1 and D2. The second voltage TFT _ Vcom is connected to the control end of the second switching tube Q2, the first end of the second switching tube Q2 is connected to the control end of the third switching tube Q3, the second end of the third switching tube Q3 is connected to the first end of the sixth switching tube Q6, the first end of the sixth switching tube Q6 is connected to the control end, the second end of the second switching tube Q2 is connected to the second end of the sixth switching tube Q6, the control end of the sixth switching tube Q6 is connected to the control end of the first switching tube Q1, the first end of the first switching tube Q1 is connected to the second end of the fourth switching tube Q4, the control end of the fourth switching tube Q4 is connected to the first end of the fifth switching tube Q5, the control end of the fifth switching tube Q5 is connected to the first voltage DC _ Vcom, the second end of the fifth switching tube Q5 is connected to the second end of the first switching tube Q1, the second end of the sixth switching tube Q6, and the second end of the sixth switching tube Q2 is connected to the ground. The second end of the fourth switching tube Q4 is further connected to the control end of a seventh switching tube Q7, the second end of the seventh switching tube Q7 is connected to the second end of the eighth switching tube Q8 and the second end of the fifth switching tube Q5, the first end of the seventh switching tube Q7 is connected to the control end of the ninth switching tube Q9, the second end of the ninth switching tube Q9 is connected to the control end of the eighth switching tube Q8, and the first end of the ninth switching tube Q9 is connected to the first end of the eighth switching tube Q8 and the output end of the third voltage CF _ Vcom, so as to output the third voltage CF _ Vcom. A first end of the tenth switching tube Q10 is connected to the power supply terminal VDDA, a first end of the tenth switching tube Q10 is further connected to the control terminal, a second end of the tenth switching tube Q10 is connected to the output terminal of the third voltage CF _ Vcom, and a control terminal of the tenth switching tube Q10 is connected to the control terminal of the ninth switching tube Q9 through the diode D2 and the diode D1 in sequence. The control end of the second switching tube Q2 is connected to the second end of the second switching tube Q2 through an eighth resistor R8, the control end of the second switching tube Q2 is further connected to the output end of the third voltage CF _ Vcom through a ninth resistor R9, the first end of the third switching tube Q3 is sequentially connected to the output end of the third voltage CF _ Vcom through a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, and the first end of the third switching tube Q3 is further connected to the control end of the tenth switching tube Q10 through a second resistor R2 and a third resistor R3. The first end of the fourth switching tube Q4 is connected to a node between the fifth resistor R5 and the sixth resistor R6, the first end of the fourth switching tube Q4 is connected to the output end of the third voltage CF _ Vcom through the first resistor R1 and the capacitor C2, and the control end and the second end of the fifth switching tube Q5 are connected through the seventh resistor R7. The node between the second resistor R2 and the third resistor R3 is grounded through the capacitor C1.
Referring to fig. 5, in the common voltage compensation circuit of the present application, the first voltage DC _ Vcom is a stable voltage; the second voltage TFT _ Vcom is a voltage which jumps periodically and the jump amplitude is larger than a preset threshold value; the third voltage CF _ Vcom is the voltage which has the same period and phase as the second voltage but has the amplitude smaller than that of the second voltage TFT _ Vcom; the fourth voltage feedback _ Vcom is the same as the third voltage CF _ Vcom in period, opposite in phase and same in amplitude; the fifth voltage final _ Vcom is a voltage obtained by superimposing the second voltage TFT _ Vcom and the fourth voltage feedback _ Vcom. In fig. 5, a waveform diagram shown by a dotted line is a waveform diagram of the second voltage TFT _ Vcom.
Fig. 6 shows a flowchart of a common voltage compensation method of an embodiment of the present invention. The common voltage compensation method is applicable to a liquid crystal display panel including a plurality of gate lines and a plurality of data lines, and referring to fig. 6 and 3b, the common voltage compensation method of the present application includes the following steps.
Step S01: and detecting the jump amplitude of the second voltage of the display panel.
An electric field is generated between the common electrode and the pixel electrode of the display panel 110, and the electric field controls the rotation of the liquid crystal molecules to change the light transmittance of each pixel unit, thereby implementing image display.
The common voltage may be deflected due to the influence of various circuit traces in the display panel 110 before reaching the common electrode of the display panel 110. In this embodiment, the initial common voltage is denoted as a first voltage DC _ Vcom, and the common voltage deflected after reaching the display panel 110 is denoted as a second voltage TFT _ Vcom.
The triggering module 241 is connected to the display panel 110 and configured to detect an amplitude of the second voltage TFT _ Vcom, so that an offset between the second voltage TFT _ Vcom and the first voltage DC _ Vcom can be determined according to the amplitude of the second voltage TFT _ Vcom. The detection of the magnitude of the second voltage TFT _ Vcom includes both the case of the normal picture and the case of the heavy-load picture.
Step S02: and judging whether the jump amplitude of the second voltage is larger than a preset threshold value.
Since the second voltage TFT _ Vcom is a voltage after the first voltage DC _ Vcom is shifted, the first voltage DC _ Vcom is used as a reference voltage when detecting the transition amplitude of the second voltage TFT _ Vcom. In this step, if the jump amplitude of the second voltage TFT _ Vcom is greater than the preset threshold, the offset of the second voltage TFT _ Vcom is considered to be greater than the error range, and step S03 needs to be performed to compensate, so that the final picture display effect of the display panel 110 is good.
In this embodiment, the preset threshold is, for example, an offset of the second voltage TFT _ Vcom which does not affect the display effect of the display panel 110, and is also a maximum value of an error range of the second voltage TFT _ Vcom compared with the first voltage DC _ Vcom.
In this embodiment, the method further includes periodically detecting the second voltage TFT _ Vcom, and determining whether the amplitude jump of the second voltage TFT _ Vcom is periodic, if so, it indicates that the influence of the second voltage TFT _ Vcom is always present and needs to be compensated; if not, it may be a factor of chance that affects the second voltage TFT _ Vcom.
In this embodiment, when detecting whether the second voltage TFT _ Vcom of the display area of the display panel 110 is shifted, the determined criteria include whether the transition amplitude has periodicity and whether the transition amplitude is greater than a preset threshold, the third voltage is generated for compensation only after meeting the criteria, and the compensation voltage is not generated if not. The method for determining whether to generate the compensation voltage according to the offset result of the second voltage TFT _ Vcom ensures that the common voltage of the final display area is always in a relatively stable state, thereby reducing the problem of picture flicker.
Step S03: and collecting the second voltage, and generating a third voltage according to the second voltage and the first voltage.
In this step, the compensation module 242 generates a third voltage CF _ Vcom according to the first voltage DC _ Vcom and the second voltage TFT _ Vcom, for example, the difference between the first voltage DC _ Vcom and the second voltage TFT _ Vcom.
In this embodiment, as can be seen from the waveform diagram shown in fig. 5, the first voltage DC _ Vcom is a direct current voltage, but the second voltage TFT _ Vcom is an alternating current voltage, so the third voltage CF _ Vcom obtained from the first voltage DC _ Vcom and the second voltage TFT _ Vcom is also an alternating current voltage. At this time, the third voltage CF _ Vcom has the same period, the same phase as the second voltage TFT _ Vcom, but the magnitude of the third voltage CF _ Vcom is not greater than that of the second voltage TFT _ Vcom.
Step S04: the third voltage is input to the display area and the third voltage is inverted to generate a fourth voltage.
In this step, the fourth voltage feedback _ Vcom is an inverted voltage of the third voltage CF _ Vcom, i.e. the fourth voltage feedback _ Vcom and the third voltage CF _ Vcom have the same period but opposite phases. In this embodiment, before the third voltage CF _ Vcom enters the display region of the display panel 110, the fourth voltage feedback _ Vcom is generated under the action of the electric field of the conductive line in the frame of the display panel 110.
In this embodiment, the third voltage CF _ Vcom is inverted according to the electric field action to generate the fourth voltage feedback _ Vcom, thereby saving a device for inverting the third voltage CF _ Vcom and reducing the cost.
Step S05: the fourth voltage and the second voltage are superposed to form a common voltage of the display panel.
The inverted fourth voltage feedback _ Vcom reaches the display region of the display panel 110 and is overlapped with the second voltage TFT _ Vcom, because the periods of the fourth voltage feedback _ Vcom and the second voltage TFT _ Vcom are the same and the phases are opposite, and the amplitude of the fourth voltage feedback _ Vcom is not greater than that of the second voltage TFT _ Vcom, therefore, the fifth voltage final _ Vcom formed by overlapping the fourth voltage feedback _ Vcom and the second voltage TFT _ Vcom is a voltage similar to a direct current, the offset of the fifth voltage final _ Vcom is smaller than a preset threshold and is within an error range, and it is ensured that the common voltage of the final display region is always in a relatively stable state, thereby reducing the problem of image flicker.
According to the public voltage compensation method and the public voltage compensation circuit, whether the second voltage of the display area deviates or not is detected, the third voltage is generated according to the second voltage of the display area, the third voltage is the compensation voltage, the deviation amount of the second voltage which originally deviates is reduced, the fifth voltage which is stable is obtained, and therefore the problems that pictures flicker and the like caused by deviation of the second voltage are solved.
According to the public voltage compensation method and the public voltage compensation circuit, the phase of the third voltage is the same as that of the second voltage, but before the third voltage enters the display area, a fourth voltage opposite to the third voltage is generated under the action of an electric field, so that the fourth voltage and the second voltage are superposed to generate a relatively stable fifth voltage. According to the method and the device, the third voltage is inverted according to the action of the electric field, so that devices for inverting the third voltage are saved, and the cost is reduced.
According to the public voltage compensation method and the compensation circuit, when whether the second voltage of the display area deviates or not is detected, the judged standard comprises whether the jump amplitude is periodic or not and whether the jump amplitude is larger than a preset threshold or not, the third voltage is generated for compensation only after the jump amplitude meets the standard, and the compensation voltage is not generated if the jump amplitude does not meet the standard. The method for determining whether to generate the compensation voltage according to the offset result of the second voltage ensures that the common voltage of the final display area is always in a relatively stable state, thereby reducing the problem of picture flicker.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A common voltage compensation circuit for a display panel, comprising:
the trigger module is connected with the display panel and used for inputting a first voltage and comparing the amplitude of a second voltage in the display panel with a preset threshold value, wherein the second voltage is the voltage of the first voltage after deflection in the display panel, and the first voltage is an initial public voltage;
the common voltage compensation circuit for the display panel further comprises a compensation module which is connected with the trigger module and the display panel, and generates a third voltage according to the first voltage and the second voltage when the amplitude of the second voltage periodically jumps and the jumped amplitude is larger than a preset threshold value,
the compensation module comprises a subtracter, the third voltage is the difference value of the first voltage and the second voltage, and the period and the phase of the third voltage are the same as those of the second voltage;
the third voltage is a compensation voltage, and before the third voltage enters the display area, a fourth voltage is generated under the action of an electric field, wherein the period of the fourth voltage is the same as that of the third voltage, and the phase of the fourth voltage is opposite to that of the third voltage.
2. The common voltage compensation circuit according to claim 1, wherein the third voltage has the same period and the same phase as the second voltage, and has a smaller magnitude than the second voltage.
3. The common voltage compensation circuit of claim 2, wherein the final common voltage of the display panel is a fifth voltage obtained by superimposing the fourth voltage and the second voltage.
4. The common voltage compensation circuit of claim 1, wherein the compensation module comprises:
a first input terminal connected to the first voltage to receive the first voltage;
the second input end is connected with the trigger module to receive the second voltage;
and the output end is connected with the display panel to output the third voltage.
5. The common voltage compensation circuit of claim 4, wherein the compensation module comprises: a control end of the fifth switching tube is connected with the first input end, and a second end of the fifth switching tube is grounded; the seventh resistor is connected with the control end and the second end of the fifth switching tube; a control end of the fourth switching tube is connected with a first end of the fifth switching tube; a first end of the first switching tube is connected with a second end of the fourth switching tube, and a second end of the first switching tube is connected with a second end of the fifth switching tube; the control end of the second switching tube is connected with the second input end, and the second end of the second switching tube is connected with the second end of the fifth switching tube; a control end of the third switching tube is connected with the first end of the second switching tube, and a second end of the third switching tube is connected with the control end of the first switching tube; a control end of the sixth switching tube is connected with a control end of the first switching tube, a first end of the sixth switching tube is connected with a second end of the third switching tube, and a second end of the sixth switching tube is connected with a second end of the fifth switching tube; the eighth resistor is connected with the control end and the second end of the second switching tube; a ninth resistor connected to the second input terminal and the output terminal; a control end of the seventh switching tube is connected with the first end of the first switching tube, and a second end of the seventh switching tube is connected with the second end of the fifth switching tube; a control end of the ninth switching tube is connected with a first end of the seventh switching tube, and the first end is connected with the output end; the control end of the eighth switching tube is connected with the second end of the ninth switching tube, the first end of the eighth switching tube is connected with the first end of the ninth switching tube, and the second end of the eighth switching tube is connected with the second end of the fifth switching tube; a tenth switching tube, wherein a control end and a first end of the tenth switching tube are connected with a power supply end, and a second end of the tenth switching tube is connected with the output end; the first end of the fourth switching tube is connected with the output end through the sixth resistor; two ends of the fourth resistor and the fifth resistor are connected with the first end of the third switching tube and the first end of the fourth switching tube respectively; the anode of the first diode is connected with the control end of the ninth switching tube, and the cathode of the second diode is connected with the control end of the tenth switching tube; the first resistor and the second capacitor are connected in series, the first resistor is further connected with the first end of the fourth switching tube, and the second capacitor is further connected with the output end; the second resistor and the third resistor are connected in series, the second resistor is further connected with the first end of the third switching tube, and the third resistor is further connected with the control end of the tenth switching tube; and one end of the first capacitor is connected with the connecting end of the second resistor and the third resistor, and the other end of the first capacitor is grounded.
6. A common voltage compensation method for a display panel, comprising:
detecting the amplitude of a second voltage of the display panel and comparing the amplitude with a preset threshold, wherein the second voltage is the voltage of the first voltage after the first voltage deflects in the display panel, and the first voltage is an initial common voltage;
when the amplitude of the second voltage periodically jumps and the jumped amplitude is larger than the preset threshold, acquiring the second voltage, and generating a third voltage according to a first voltage and the second voltage, wherein the third voltage is a difference value between the first voltage and the second voltage, and the period and the phase of the third voltage are the same as those of the second voltage;
inputting the third voltage into a display area,
the third voltage is a compensation voltage, and after entering the display panel, the third voltage generates a fourth voltage under the action of an electric field, wherein the fourth voltage has the same period as the third voltage and has an opposite phase.
7. The common voltage compensation method of claim 6, wherein the detecting the magnitude of the second voltage of the display panel further comprises detecting whether a magnitude jump of the second voltage has periodicity.
8. The common voltage compensation method according to claim 6, wherein the third voltage has the same period and the same phase as the second voltage, and the magnitude of the third voltage is smaller than the magnitude of the second voltage.
9. The method of claim 6, wherein the final common voltage of the display panel is a fifth voltage obtained by superimposing the fourth voltage on the second voltage.
10. A display device characterized by comprising the common voltage compensation circuit according to any one of claims 1 to 5.
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