CN115035869A - 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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- CN115035869A CN115035869A CN202210708686.4A CN202210708686A CN115035869A CN 115035869 A CN115035869 A CN 115035869A CN 202210708686 A CN202210708686 A CN 202210708686A CN 115035869 A CN115035869 A CN 115035869A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005070 sampling Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 2
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0209—Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
Abstract
The utility model relates to a public voltage compensation circuit, compensation method and display device, this public voltage compensation circuit is used for the display panel, the display panel divides into at least two part regions along its longitudinal direction, public voltage compensation circuit includes with every part region respectively connected at least two public voltage compensation unit, every public voltage compensation unit includes feedback signal line, public voltage compensation line and inverting amplifier, feedback signal line and public voltage compensation line form in the metal level of display panel, inverting amplifier is close to the bottom of display panel sets up and connects feedback signal line and public voltage compensation line. According to the display panel, voltage compensation is respectively carried out on different partial areas of the display panel, so that the common voltage can be more accurately compensated, poor display caused by common voltage disturbance such as image sticking, crosstalk and Greenish is improved, the quality of the display panel is improved, and the manufacturing cost of the display panel is reduced.
Description
Technical Field
The disclosure 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, the performance requirements of liquid crystal display panels are higher and higher, and the stability of common Voltage (VCOM) is one of the keys for ensuring the display quality. In order to stabilize the common voltage, as shown in fig. 1, in the prior art, a far end (one end of the display panel far from the bottom circuit portion) is generally used to obtain a Feedback signal (Feedback), the Feedback signal is reversely amplified by a circuit, and then the Feedback signal is compensated to the far end, the middle end and the near end of the display panel respectively. The method comprises the steps that a feedback signal is obtained by sampling from a far end of a display panel and is used for compensating common voltages of a near end, a middle end and a far end, on one hand, the common voltage disturbance conditions of the middle end and the near end of the display panel cannot be reflected by sampling from the far end, and the compensation effect on the middle end and the near end is not ideal; on the other hand, the compensation point at the far end can influence the feedback signal, thereby influencing the common voltage compensation at the middle end and the near end.
Disclosure of Invention
The embodiment of the disclosure provides a common voltage compensation circuit, a compensation method and a display device, which can solve the common voltage compensation problem of a display panel.
According to one aspect of the present disclosure, a common voltage compensation circuit is provided for a display panel, the display panel is divided into at least two partial regions along a longitudinal direction of the display panel, the common voltage compensation circuit includes at least two common voltage compensation units respectively connected to each partial region, each common voltage compensation unit includes a feedback signal line, a common voltage compensation line and an inverting amplifier, the feedback signal line and the common voltage compensation line are formed on a metal layer of the display panel, and the inverting amplifier is disposed near a bottom of the display panel and connects the feedback signal line and the common voltage compensation line.
In some embodiments, the display panel includes a distal end region, a middle end region, and a proximal end region, the common voltage compensation unit includes a first common voltage compensation unit connected to the distal end region, a second common voltage compensation unit connected to the middle end region, and a third common voltage compensation unit connected to the proximal end region, the first common voltage compensation unit includes a first feedback signal line, a first common voltage compensation line, and a first inverting amplifier connecting the first feedback signal line and the first common voltage compensation line, the second voltage compensation unit includes a second feedback signal line, a second common voltage compensation line, and a second inverting amplifier connecting the second feedback signal line and the second common voltage compensation line, and the third common voltage compensation unit includes the second feedback signal line, a third inverting amplifier connecting the second feedback signal line and the second common voltage compensation line, A third common voltage compensation line and a third inverting amplifier connected to the second feedback signal line and the third common voltage compensation line.
In some embodiments, the display panel includes a distal end region, a middle end region, and a proximal end region, the common voltage compensation unit includes a first common voltage compensation unit connected to the distal end region, a second common voltage compensation unit connected to the middle end region, and a third common voltage compensation unit connected to the proximal end region, the first common voltage compensation unit includes a first feedback signal line, a first common voltage compensation line, and a first inverting amplifier connecting the first feedback signal line and the first common voltage compensation line, the second voltage compensation unit includes a second feedback signal line, a second common voltage compensation line, and a second inverting amplifier connecting the second feedback signal line and the second common voltage compensation line, and the third common voltage compensation unit includes a third feedback signal line, a third common voltage compensation line, and a third inverting amplifier connecting the third feedback signal line and the third common voltage compensation line A third inverting amplifier of the line.
In some embodiments, the display panel includes a display region and a GOA region disposed at both sides of the display region, the feedback signal line and the common voltage compensation line connected to a proximal region near the display panel are located between the display region and the GOA region, and the feedback signal line and the common voltage compensation line connected to a distal region near the display panel are located outside the GOA region.
In some embodiments, the feedback signal line and the common voltage compensation line are formed in the same metal layer of the display panel, the metal layer including a gate signal line layer or a data signal line layer.
In some embodiments, the feedback signal line and the common voltage compensation line are formed at different metal layers of the display panel, one of the feedback signal line and the common voltage compensation line is formed at a gate signal line layer, and the other is formed at a data signal line layer, and the feedback signal line and the common voltage compensation line are connected through a via hole formed at a conductive layer.
In some embodiments, at least one metal line is connected between the second common voltage compensation line and the third common voltage compensation line.
In some embodiments, the metal lines are disposed at a position near a middle end region of the display panel.
In some embodiments, the inverting amplifier includes an operational amplifier, a first resistor, a second resistor, and a capacitor, the inverting amplifier includes an inverting input terminal, a non-inverting input terminal, and an output terminal, the non-inverting input terminal inputs a reference common voltage, the inverting input terminal is connected to the feedback signal line to input a feedback voltage, the output terminal is connected to the common voltage compensation line to output a compensation voltage, the first resistor is connected between the inverting input terminal and the capacitor, and the second resistor is connected between the inverting input terminal and the output terminal.
According to one aspect of the present disclosure, there is also provided a common voltage compensation method for a display panel, including:
dividing the display panel into at least two partial areas along the longitudinal direction of the display panel;
at least two common voltage compensation units respectively connected with each partial area are arranged;
common voltage compensation is carried out on the corresponding partial area through the common voltage compensation unit;
the common voltage compensation unit comprises a feedback signal line, a common voltage compensation line and an inverting amplifier, wherein the feedback signal line and the common voltage compensation line are formed on a metal layer of the display panel, and the inverting amplifier is arranged close to the bottom of the display panel and is connected with the feedback signal line and the common voltage compensation line.
According to one aspect of the present disclosure, there is also provided a display device including the common voltage compensation circuit.
The common voltage compensation circuit, the compensation method and the display device provided by the various embodiments of the present disclosure divide the display panel into at least two partial regions along the longitudinal direction thereof, each partial region is provided with a corresponding common voltage compensation unit, each common voltage compensation unit comprises a feedback signal line, a common voltage compensation line and a reverse amplifier, the feedback signal lines of different common voltage compensation units can be used for respectively sampling in different partial regions, voltage compensation is respectively performed for different partial regions according to the common voltage disturbance conditions of different partial regions, multi-point sampling and multi-point compensation are realized, thereby compensating the common voltage more accurately, solving the problem that a single sampling point disturbs compensation in different regions, optimizing the common voltage compensation effect, improving poor display caused by common voltage disturbance such as image retention, crosstalk, Greenish and the like, the quality of the display panel is improved. In addition, the public voltage compensation problem of the display panel can be effectively solved through the wiring design of the feedback signal line and the public voltage compensation line on the premise of not increasing or changing circuit components, and the manufacturing cost of the display panel is reduced.
Drawings
FIG. 1 illustrates a prior art common voltage compensation scheme;
FIG. 2 is a schematic diagram illustrating a routing structure of a common voltage compensation circuit in a display panel according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of a common voltage compensation circuit according to an embodiment of the present disclosure;
fig. 4 shows a schematic structural diagram of an inverting amplifier of an embodiment of the disclosure;
fig. 5 is a schematic diagram illustrating a routing structure of another common voltage compensation circuit in a display panel according to an embodiment of the disclosure;
FIG. 6 shows a schematic circuit diagram of another common voltage compensation circuit of an embodiment of the present disclosure;
fig. 7 is a schematic diagram illustrating a routing structure of a common voltage compensation circuit in a display panel according to an embodiment of the disclosure;
fig. 8 is a schematic diagram illustrating a routing structure of a common voltage compensation circuit in a display panel according to an embodiment of the disclosure;
FIG. 9 illustrates a schematic cross-sectional structure of a connecting via of an embodiment of the present disclosure;
fig. 10 illustrates a common voltage disturbance test chart inside a display panel when common voltage compensation lines of the embodiment of the present disclosure have different resistances.
Reference numerals:
101-distal region, 102-middle region, 103-proximal region; 11-a first feedback signal line, 12-a first common voltage compensation line, 13-a first inverting amplifier; 21-a second feedback signal line, 22-a second common voltage compensation line, 23-a second inverting amplifier; 31-a third feedback signal line, 32-a third common voltage compensation line, 33-a third inverting amplifier; 4-via holes; 5-metal lines.
Detailed Description
Various aspects and features of the disclosure are described herein with reference to the drawings.
It will be understood that various modifications may be made to the embodiments of the present application. Accordingly, the foregoing description should not be construed as limiting, but merely as exemplifications of embodiments. Other modifications will occur to those skilled in the art within the scope and spirit of the disclosure.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and, together with a general description of the disclosure given above, and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.
These and other characteristics of the present disclosure will become apparent from the following description of preferred forms of embodiment, given as non-limiting examples, with reference to the attached drawings.
It is also to be understood that although the present disclosure has been described with reference to certain specific examples, those skilled in the art will be able to ascertain many other equivalents to the present disclosure.
The above and other aspects, features and advantages of the present disclosure will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the disclosure that may be embodied in various forms. Well-known and/or repeated functions and structures have not been described in detail so as not to obscure the present disclosure with unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
Fig. 2 to 9 show structural schematic diagrams of a common voltage compensation circuit of an embodiment of the present disclosure;
fig. 10 shows a common voltage disturbance test diagram inside a display panel when common voltage compensation lines of the embodiment of the present disclosure have different resistances. As shown in fig. 2 to 10, the present disclosure provides a common voltage compensation circuit for a display panel, the display panel is divided into at least two partial regions along a longitudinal direction of the display panel, the common voltage compensation circuit includes at least two common voltage compensation units respectively connected to each partial region, each common voltage compensation unit includes a feedback signal line, a common voltage compensation line, and an inverting amplifier, the feedback signal line and the common voltage compensation line are formed in a metal layer of the display panel, and the inverting amplifier is disposed near a bottom of the display panel and connects the feedback signal line and the common voltage compensation line.
The common voltage compensation circuit provided by the embodiment of the present disclosure divides the display panel into at least two partial regions along the longitudinal direction thereof, a corresponding common voltage compensation unit is arranged in each partial area, each common voltage compensation unit comprises a feedback signal line, a common voltage compensation line and an inverting amplifier, the feedback signal lines of different common voltage compensation units can be used to sample different partial areas respectively, according to the common voltage disturbance condition of different partial areas, respectively making voltage compensation for different partial areas to implement multipoint sampling and multipoint compensation, therefore, the public voltage can be compensated more accurately, the problem that a single sampling point interferes compensation in different areas is solved, the public voltage compensation effect is optimized, bad display caused by public voltage disturbance such as residual image, crosstalk and Greenish is improved, and the quality of the display panel is improved.
In addition, in this embodiment, the common voltage compensation problem of the display panel can be effectively solved and the manufacturing cost of the display panel can be reduced by the wiring design of the feedback signal line and the common voltage compensation line without adding or changing circuit components (the inverting amplifier is still arranged in the circuit part of the display panel).
It is understood that the display panel is generally a regular rectangular or square flat plate structure, the longitudinal direction of the display panel refers to the length direction of the display panel, the display panel structure includes a display panel portion and a circuit portion, and the electrical components (such as the integrated circuit driving chip IC) of the circuit portion are generally disposed at the bottom of the display panel in the length direction. The bottom part close to the display panel is the position close to the circuit part of the display panel. After the display panel is divided into at least two partial areas along the longitudinal direction of the display panel, one end area of the display panel part far away from the circuit part is a far end area, and one end area of the display panel part close to the circuit part is a near end area.
In some embodiments, as shown in fig. 2 and 3, the display panel includes a far end region 101, a middle end region 102, and a near end region 103, the common voltage compensation unit includes a first common voltage compensation unit connected to the far end region 101, including a first feedback signal line 11, a first common voltage compensation line 12, and a first inverting amplifier 13 connecting the first feedback signal line 11 and the first common voltage compensation line 12, a second common voltage compensation line 22, including a second feedback signal line 21, and a second inverting amplifier 23 connecting the second feedback signal line 21 and the second common voltage compensation line 22, and a third common voltage compensation unit connected to the near end region 103, including the second feedback signal line 21, the second common voltage compensation line 22, and a third inverting amplifier 23 connecting the second feedback signal line 21 and the second common voltage compensation line 22, A third common voltage compensation line 32, and a third inverting amplifier 33 connecting the second feedback signal line 21 and the third common voltage compensation line 32.
The first feedback signal line 11 is a common voltage sampling point at the far end area of the display panel, and the feedback voltage signal at the first feedback signal line 11 is reversely amplified by the first inverting amplifier 13 to generate a first common voltage compensation signal, which is used for compensating the common voltage signal at the far end area 101 of the display panel.
As shown in fig. 4, the inverting amplifier includes an operational amplifier (OP), a first resistor (R1), a second resistor (R2), and a capacitor (C), and includes an inverting input terminal (-), a non-inverting input terminal (+) to which a reference common voltage (i.e., a dc voltage) is input, and an Output terminal (Output), the inverting input terminal being connected to the Feedback signal line to input a Feedback voltage (Feedback), the Output terminal being connected to the common voltage compensation line to Output a compensation voltage, the first resistor being connected between the inverting input terminal and the capacitor, and the second resistor being connected between the inverting input terminal and the Output terminal. The inverting amplifier inversely compensates for a disturbance of the common voltage input to the inverting input terminal at a level of the reference common voltage input to the non-inverting input terminal of the operational amplifier according to a resistance ratio of the resistors R1 and R2, and then outputs the generated voltage to the output terminal, achieving compensation of the common voltage.
In this embodiment, the middle area 102 and the near area 103 of the display panel may use the same feedback signal line (the second feedback signal line 21) for sampling, and the feedback voltage signal at the second feedback signal line 21 is reversely amplified by the second inverting amplifier 23 to generate a second common voltage compensation signal, so as to compensate the common voltage signal of the middle area 102; the feedback voltage signal at the second feedback signal line 21 is inversely amplified by the third inverting amplifier 33 to generate a third common voltage compensation signal to compensate the common voltage signal at the near end region 103.
In other embodiments, as shown in fig. 5 and 6, the display panel also includes a far end region 101, a middle end region 102, and a near end region 103, the common voltage compensation unit includes a first common voltage compensation unit connected to the far end region 101, including a first feedback signal line 11, a first common voltage compensation line 12, and a first inverting amplifier 13 connecting the first feedback signal line 11 and the first common voltage compensation line 12, a second common voltage compensation line 22, including a second feedback signal line 21, and a second inverting amplifier 23 connecting the second feedback signal line 21 and the second common voltage compensation line 22, and a third common voltage compensation unit connected to the near end region 103, including a third feedback signal line 31, a middle end region 102, and a near end region 103, A third common voltage compensation line 32, and a third inverting amplifier 33 connecting the third feedback signal line 31 and the third common voltage compensation line 32.
In this embodiment, the middle area 102 and the near area 103 of the display panel respectively use different feedback signal lines for sampling, and generate corresponding common voltage compensation signals after being amplified by respective inverting amplifiers, so as to compensate the common voltage of the middle area 102 and the near area 103 respectively.
As the larger the size of the display panel is, the larger the disturbance difference of the common voltage in different areas of the panel is, and the larger multiple compensation needs to be performed in the near-end area 103, therefore, when the size of the display panel is larger, the accurate compensation of the common voltage in each area can be ensured by respectively setting corresponding feedback signal lines in different areas for sampling; the smaller the size of the display panel is, the smaller the difference of the common voltage disturbances in different regions of the panel is, and the compensation multiple of the near-end region 103 is small or no compensation is performed, so that when the size of the display panel is small, the second feedback signal line 21 can be used to sample and compensate the near-end region 103 from the middle region 102, thereby reducing the wiring and the cost.
In some embodiments, the display panel includes a display region and Gate drive on Array (GOA) regions disposed at both sides of the display region, the feedback signal line and the common voltage compensation line connected to a near-end region (a region of the display panel portion near one end of the circuit portion) near the display panel are located between the display region and the GOA regions, and the feedback signal line and the common voltage compensation line connected to a far-end region (a region of the display panel portion far from one end of the circuit portion) near the display panel are located outside the GOA regions.
The GOA area is used for transmitting a grid scanning signal to the sub-pixels of the display area through the grid scanning line. Through setting up partial feedback signal line and common voltage compensation line between display area and GOA district, set up another partial feedback signal line and common voltage compensation line in the outside in GOA district, can lay wire on the basis that does not influence current wiring, conveniently walk the line, and can avoid the mutual interference between the partial feedback signal line, simultaneously, can also avoid causing the influence to other signal lines (for example above-mentioned grid scanning line), guarantee display panel's reliable work.
In this embodiment, the GOA regions are located on the left and right sides of the display region for bilateral driving, and therefore, the corresponding common voltage compensation units can be respectively disposed on the left and right sides of the display panel, and the structures of the common voltage compensation units on the left and right sides are the same, which is not described herein again.
In some embodiments, the feedback signal line and the common voltage compensation line are formed in the same metal layer of the display panel, and the metal layer includes a Gate signal line layer (Gate layer) or a data signal line layer (SD layer), which facilitates uniform fabrication of signal lines.
In some embodiments, as shown in fig. 7 to 9, the feedback signal line and the common voltage compensation line are formed at different metal layers of the display panel, one of the feedback signal line and the common voltage compensation line is formed at a gate signal line layer, and the other is formed at a data signal line layer, and the feedback signal line and the common voltage compensation line are connected through a via hole 4 formed at a conductive layer (ITO layer).
An insulating layer is arranged between the grid signal line layer and the data signal line layer to avoid the mutual influence of signals. In this embodiment, the feedback signal line and the common voltage compensation line are formed on different metal layers of the display panel, so that signal interference when the feedback signal line and the common voltage compensation line are arranged on the same metal layer can be avoided, and the feedback signal line and the common voltage compensation line can be arranged in a limited space by fully utilizing the structure (such as the via hole 4) of the display panel, so that the structure is reasonable and the manufacture is convenient.
Preferably, as shown in fig. 7 and 8, in this embodiment, the feedback signal line and the common voltage compensation line near the edge region of the display panel are formed in different metal layers and connected through the via hole 4, and the feedback signal line and the common voltage compensation line in the middle region of the display panel (for example, the middle region 102) are formed in the same metal layer, so as to avoid the influence on the display effect of the display panel caused by the via hole 4 formed in the middle region of the display panel. For example, in the present embodiment, the first feedback signal line 11 and the first common voltage compensation line 12 are formed in different metal layers and connected through the via 4, and the third feedback signal line 31 and the third common voltage compensation line 32 are formed in different metal layers and connected through the via 4; the second feedback signal line 21 and the second common voltage compensation line 22 are formed in the same metal layer.
In some embodiments, as shown in fig. 7 and 8, at least one metal line 5 is connected between the second common voltage compensation line 22 and the third common voltage compensation line 32. By providing the metal lines 5 (e.g., three metal lines in the present embodiment), on one hand, the resistance of the second common voltage compensation line 22 can be reduced, and the compensation effect of the common voltage can be improved; on the other hand, the common voltage compensation point near the middle end region 102 may be increased, and the single-point compensation may be changed to the multi-point compensation near the middle end region 102, thereby improving the compensation effect of the middle end region 102.
As shown in fig. 10, actual tests on the common voltage compensation lines under different resistances show that the common voltage compensation line has less disturbance in the common Voltage (VCOM) inside the display panel when the resistance is 5 Ω than 90 Ω, and the compensation effect is better.
Further, the metal lines 5 are disposed at positions near the middle end region 102 of the display panel. In this embodiment, since the compensation of the near end region 103 is little or no compensation, the reliable compensation of the middle end region 102 can be ensured by disposing the metal lines 5 at a position close to the middle end region 102 of the display panel.
In a specific implementation, the number and the position of the metal lines 5 may be set according to actual needs, and this embodiment is not particularly limited, for example, when the second feedback signal line 21 of the middle region 102 is used to compensate the common voltage signal of the near region 103, since the near region 103 is far away from the second feedback signal line 21, in order to improve the common voltage compensation effect, the metal lines 5 may be set at a position close to the near region 103, so as to improve the common voltage compensation effect of the near region 103 by multi-point compensation near the near region 103.
In the above embodiment, the common voltage compensation that divides the display panel into three partial regions, i.e., a far end region, a middle end region and a near end region, has been mainly described, in a specific implementation, the display panel may also be divided into two partial regions, i.e., the far end region and the near end region, or may be divided into a greater number of partial regions (for example, when the size of the display panel is larger), and the disclosure is not particularly limited. In this embodiment, divide into three subregion, when guaranteeing the accurate compensation in each region, can reduce the quantity of electrical components such as inverting amplifier and circuit wiring, rational in infrastructure, compact, when guaranteeing display panel display effect, can effective reduce cost.
The embodiment of the present disclosure further provides a common voltage compensation method for a display panel, including:
s101: dividing the display panel into at least two partial areas along the longitudinal direction of the display panel;
s102: at least two common voltage compensation units respectively connected with each partial area are arranged;
s103: common voltage compensation is carried out on the corresponding partial area through the common voltage compensation unit;
the common voltage compensation unit comprises a feedback signal line, a common voltage compensation line and an inverting amplifier, wherein the feedback signal line and the common voltage compensation line are formed on a metal layer of the display panel, and the inverting amplifier is arranged close to the bottom of the display panel and is connected with the feedback signal line and the common voltage compensation line.
Specifically, according to the partial areas divided by the display panel, each partial area is respectively connected with a corresponding public voltage compensation unit, then the corresponding partial areas are subjected to public voltage compensation through the corresponding public compensation units, feedback signal lines of different public voltage compensation units can be utilized to sample in different partial areas respectively, voltage compensation is performed on different partial areas respectively according to the public voltage disturbance conditions of different partial areas, multi-point sampling and multi-point compensation are achieved, therefore, public voltage can be compensated more accurately, the problem that a single sampling point disturbs compensation of different areas is solved, the public voltage compensation effect is optimized, poor display caused by public voltage disturbance is improved for the residual image, crosstalk, Greenish and the like, and the quality of the display panel is improved.
The embodiment of the disclosure also provides a display device, which comprises the common voltage compensation circuit.
The feedback signal line and the common voltage compensation line of the common voltage compensation circuit are formed on the metal layer of the display panel of the display device, the inverting amplifier is arranged on the circuit part of the display panel, and the common voltage compensation problem of the display panel can be effectively solved and the manufacturing cost of the display panel is reduced through the wiring design of the feedback signal line and the common voltage compensation line on the premise that circuit components are not increased or changed (the inverting amplifier is still arranged on the circuit part of the display panel).
One example of the display device is a liquid crystal display device, and the display device may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a wearable watch, a navigator, and the like.
The common voltage compensation method and the display device provided by the embodiment of the disclosure correspond to the common voltage compensation circuit of the above embodiment, and any optional items in the common voltage compensation circuit embodiment are also applicable to the common voltage compensation method and the display device, and are not described herein again.
The above embodiments are merely exemplary embodiments of the present disclosure, which is not intended to limit the present disclosure, and the scope of the present disclosure is defined by the claims. Various modifications and equivalents of the disclosure may occur to those skilled in the art within the spirit and scope of the disclosure, and such modifications and equivalents are considered to be within the scope of the disclosure.
Claims (11)
1. The utility model provides a public voltage compensation circuit for display panel, its characterized in that, display panel divides into two at least subregion areas along its longitudinal direction, public voltage compensation circuit includes with every subregion respectively connected two at least public voltage compensation unit, every public voltage compensation unit includes feedback signal line, public voltage compensation line and inverting amplifier, the feedback signal line with public voltage compensation line forms in display panel's metal layer, inverting amplifier is close to the bottom of display panel sets up and connects feedback signal line and public voltage compensation line.
2. The common voltage compensation circuit according to claim 1, wherein the display panel includes a distal end region, a middle end region, and a proximal end region, the common voltage compensation unit includes a first common voltage compensation unit connected to the distal end region, a second common voltage compensation unit connected to the middle end region, and a third common voltage compensation unit connected to the proximal end region, the first common voltage compensation unit includes a first feedback signal line, a first common voltage compensation line, and a first inverting amplifier connecting the first feedback signal line and the first common voltage compensation line, the second voltage compensation unit includes a second feedback signal line, a second common voltage compensation line, and a second inverting amplifier connecting the second feedback signal line and the second common voltage compensation line, and the third common voltage compensation unit includes the second feedback signal line, the second common voltage compensation line, and the third common voltage compensation unit includes, A third common voltage compensation line and a third inverting amplifier connected to the second feedback signal line and the third common voltage compensation line.
3. The common voltage compensation circuit according to claim 1, wherein the display panel includes a distal end region, a middle end region, and a proximal end region, the common voltage compensation unit includes a first common voltage compensation unit connected to the distal end region, a second common voltage compensation unit connected to the middle end region, and a third common voltage compensation unit connected to the proximal end region, the first common voltage compensation unit includes a first feedback signal line, a first common voltage compensation line, and a first inverting amplifier connecting the first feedback signal line and the first common voltage compensation line, the second voltage compensation unit includes a second feedback signal line, a second common voltage compensation line, and a second inverting amplifier connecting the second feedback signal line and the second common voltage compensation line, and the third common voltage compensation unit includes a third feedback signal line, a third inverting amplifier, and a third common voltage compensation unit, A third common voltage compensation line and a third inverting amplifier connected to the third feedback signal line and the third common voltage compensation line.
4. The common voltage compensation circuit according to claim 1, wherein the display panel includes a display region and a GOA region disposed at both sides of the display region, the feedback signal line and the common voltage compensation line connected to a near end region near the display panel are located between the display region and the GOA region, and the feedback signal line and the common voltage compensation line connected to a far end region near the display panel are located outside the GOA region.
5. The common voltage compensation circuit of claim 1, wherein the feedback signal line and the common voltage compensation line are formed in a same metal layer of the display panel, the metal layer comprising a gate signal line layer or a data signal line layer.
6. The common voltage compensation circuit according to claim 1, wherein the feedback signal line and the common voltage compensation line are formed in different metal layers of the display panel, one of the feedback signal line and the common voltage compensation line is formed in a gate signal line layer, and the other is formed in a data signal line layer, and the feedback signal line and the common voltage compensation line are connected through a via hole formed in a conductive layer.
7. The common voltage compensation circuit according to claim 2 or 3, wherein at least one metal line is connected between the second common voltage compensation line and the third common voltage compensation line.
8. The common voltage compensation circuit of claim 7, wherein the metal line is disposed at a position near a middle region of the display panel.
9. The common voltage compensation circuit according to claim 1, wherein the inverting amplifier includes an operational amplifier, a first resistor, a second resistor, and a capacitor, the inverting amplifier includes an inverting input terminal, a non-inverting input terminal, and an output terminal, the non-inverting input terminal inputs a reference common voltage, the inverting input terminal is connected to the feedback signal line to input a feedback voltage, the output terminal is connected to the common voltage compensation line to output a compensation voltage, the first resistor is connected between the inverting input terminal and the capacitor, and the second resistor is connected between the inverting input terminal and the output terminal.
10. A common voltage compensation method for a display panel, comprising:
dividing the display panel into at least two partial areas along the longitudinal direction of the display panel;
at least two common voltage compensation units respectively connected with each partial area are arranged;
carrying out common voltage compensation on the corresponding partial area through the common voltage compensation unit;
the common voltage compensation unit comprises a feedback signal line, a common voltage compensation line and an inverting amplifier, wherein the feedback signal line and the common voltage compensation line are formed on a metal layer of the display panel, and the inverting amplifier is arranged close to the bottom of the display panel and is connected with the feedback signal line and the common voltage compensation line.
11. A display device characterized by comprising the common voltage compensation circuit according to any one of claims 1 to 9.
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| CN202210708686.4A CN115035869A (en) | 2022-06-21 | 2022-06-21 | Common voltage compensation circuit, compensation method and display device |
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| CN202210708686.4A CN115035869A (en) | 2022-06-21 | 2022-06-21 | Common voltage compensation circuit, compensation method and display device |
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