CN219225877U

CN219225877U - Common voltage compensation device for display panel, display panel and display device

Info

Publication number: CN219225877U
Application number: CN202222792825.4U
Authority: CN
Inventors: 刘欢; 康报虹
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2023-06-20
Anticipated expiration: 2032-10-21

Abstract

The application discloses a public voltage compensation device of a display panel, the display panel and the display device, wherein the display panel comprises a display area and a non-display area, the non-display area comprises a first side arranged along a row direction, and a second side and a third side which are oppositely arranged along a column direction; the common voltage compensation device of the display panel comprises a common voltage compensation unit arranged on a first side, an initial voltage feedback line and an initial voltage compensation line which are arranged on a second side or a third side, and a voltage feedback line and a voltage compensation line which are arranged on the first side, wherein the voltage feedback line and the voltage compensation line are far away from the second side and/or the third side and are connected with the common electrode so as to monitor and compensate the common voltage of the common electrode of the area of the display panel far away from the second side and/or the third side. Through the structure, the accuracy of compensating the public voltage is improved, and the display effect of the display panel is further improved.

Description

Common voltage compensation device for display panel, display panel and display device

Technical Field

The present disclosure relates to display panel technologies, and in particular, to a common voltage compensation device for a display panel, and a display device.

Background

Currently, liquid crystal displays (Liquid Crystal Display, LCD) are increasingly used, which utilize a voltage difference between a common electrode and a pixel electrode to drive liquid crystal molecules to rotate, thereby realizing picture display. In a liquid crystal display, as a coupling capacitance exists between a common electrode and each trace in the liquid crystal display, for example, a coupling capacitance exists between the common electrode and a data line, a coupling capacitance exists between the common electrode and a gate line, when signals on the gate line or the data line suddenly change, namely, when the signals fall from a high level to a low level, voltages at two ends of the coupling capacitance suddenly change, so that the common voltage of the common electrode fluctuates, the common electrode is difficult to keep stable, and further, the voltage difference between the common electrode and a pixel electrode is abnormal, so that the liquid crystal display has the problems of afterimage, crosstalk and the like, and the display effect is influenced. Therefore, the common voltage needs to be compensated.

In order to achieve a better display effect, vcom (voltage of common electrode) is adjusted and compensated in a large-sized display screen. In the prior art, the Vcom compensation is realized by a Vcom compensation circuit, the voltage of Vcom FB (voltage feedback line) in a panel is input to the reverse input end of the Vcom compensation circuit through two sides, the waveform of Vcom is recorded, the Vcom is input to the panel at the same time, the positive input of the compensation circuit is carried out, and the waveform opposite to the Vcom FB (voltage feedback line) is input into the plane after the processing so as to counteract the fluctuation of Vcom.

The prior art has the defects that the Vcom FB feedback can only be carried out from the left end and the right end of the panel, the larger the panel size is, the larger the gap between the middle and the edge of the display screen is, and the fed back Vcom FB waveform is distorted.

Disclosure of Invention

The technical problem that this application mainly solves is to provide a display panel's public voltage compensation arrangement and display panel, display device, improves the accuracy of compensating public voltage, reduces public voltage's fluctuation, and then improves display panel's display effect.

In order to solve the technical problems, one technical scheme adopted by the application is as follows: providing a common voltage compensation device of a display panel, wherein the display panel comprises a display area and a non-display area, the display area is provided with a common electrode, the non-display area is arranged along the periphery of the display area, and the non-display area comprises a first side arranged along the row direction, a second side and a third side which are oppositely arranged along the column direction; the common voltage compensation device comprises a common voltage compensation unit arranged on the first side, an initial voltage feedback line and an initial voltage compensation line which are arranged on the second side or the third side, and a voltage feedback line and a voltage compensation line which are arranged on the first side, wherein the voltage feedback line and the voltage compensation line are far away from the second side and/or the third side and are connected with the common electrode so as to monitor and compensate the common voltage of the common electrode of the area of the display panel far away from the second side and/or the third side.

The initial voltage feedback lines are arranged along the column direction, one ends of the initial voltage feedback lines extend to the common voltage compensation units on the first side, the other ends of the initial voltage feedback lines are connected with the common electrodes on the second side and/or the third side so as to monitor the common voltage of the common electrodes on the second side and/or the third side of the display panel, and the common voltage on the common electrodes on the second side and/or the third side is fed back to the common electrode compensation units; one end of the initial voltage compensation line is connected with the public electrode of the second side or the third side, and the other end of the initial voltage compensation line is connected with the public voltage compensation unit so as to transmit compensation voltage obtained by the public voltage compensation unit according to the public voltage fed back by the initial voltage feedback line to the public electrode of the second side and/or the third side, so that voltage compensation is carried out on the public electrode.

The common voltage compensation units comprise a plurality of common voltage compensation units which are arranged in parallel in a row along the row direction; wherein each common voltage compensation unit at least comprises one voltage feedback line and one voltage compensation line.

Each common electrode compensation unit at least comprises a flexible connection unit, and the flexible connection unit is connected with the common electrode compensation unit and the common electrode of the display area.

Each flexible connection unit is provided with a voltage feedback line and a voltage compensation line, and the voltage feedback lines and the voltage compensation lines are arranged at intervals.

The display panel further comprises a plurality of data lines and scanning lines, the scanning lines are arranged along the row direction, the data lines are arranged along the column direction, and the voltage feedback lines and the voltage compensation lines are arranged on the same layer as the data lines or the scanning lines.

The non-display area of the display panel further comprises a fan-out area, the fan-out area is trapezoid, one side, close to the display area, of the fan-out area is a long side of the trapezoid, one side, far away from the display area, of the fan-out area is a short side of the trapezoid, and the voltage feedback line and the voltage compensation line are arranged along waist edges of two sides of the trapezoid respectively.

The public voltage compensation unit is a PCB board, and the flexible connection unit is a COF.

In order to solve the technical problem, another technical scheme adopted by the application is as follows: there is provided a display panel including the common voltage compensation device of the display panel according to any of the above embodiments.

In order to solve the technical problem, another technical scheme adopted by the application is as follows: there is provided a display device including the display panel according to any of the above embodiments.

The beneficial effects of this application are: one or more voltage feedback lines and one or more voltage compensation lines are arranged at positions, far away from the second side or the third side, of the first side so as to carry out voltage compensation on the public electrode, close to the middle area of the display panel, the occurrence of distortion condition of the voltage waveform of the public electrode in the middle area caused by voltage compensation or monitoring on the public electrode from the edges of two sides of the display panel is avoided, the public voltage of the public electrode can be compensated through the voltage feedback lines and the voltage compensation lines of the first side, the accuracy of compensating the public voltage is improved, fluctuation of the public voltage is effectively reduced, the problem that the public voltage of the public electrode is influenced by a coupling capacitor to generate fluctuation is solved, and the display effect of the display panel is improved.

Drawings

For a clearer description of the technical solutions in the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

FIG. 1 is a schematic diagram of a first embodiment of a common voltage compensation device of a display panel of the present application;

FIG. 2 is a schematic diagram of an embodiment of FIG. 1;

FIG. 3 is a schematic diagram of a second embodiment of a common voltage compensation device of a display panel according to the present application;

FIG. 4 is a schematic structural diagram of a third embodiment of a common voltage compensation device of a display panel according to the present application;

fig. 5 is a schematic partial structure of an embodiment of a common voltage compensation device of a display panel of the present application.

1 a display area; 2 a non-display area; a first side; a second side B; a third side; 10 a common voltage compensation unit; 11 a common electrode; a 12 voltage feedback line; 13 voltage compensation lines; 120 initial voltage feedback lines; 130 an initial voltage compensation line; COF flexible connection units; f fan-out area.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the application clearer, the technical scheme of the embodiment of the application will be described in further detail below with reference to the accompanying drawings.

The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two, but does not exclude the case of at least one.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

It should be understood that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Compared with the technical scheme that the voltage feedback line and the voltage compensation line at two side edges of the display panel compensate the voltage of the common electrode in the prior art, the application is characterized in that: and the common electrode in the middle area is compensated by adding a feedback route in the middle area of the display screen, so that the compensation effect is improved.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a common voltage compensation device of a display panel of the present application. As shown in fig. 1, the display panel includes a display area 1 and a non-display area 2, and the non-display area 2 is disposed along the periphery of the display area 1.

Specifically, the non-display area 2 includes a first side a disposed in the row direction, and a second side B and a third side C disposed in the column direction, the second side B being disposed on opposite sides of the display area 1 opposite to the third side C.

The display area 1 is provided with a common electrode 11, the common electrode 11 comprises a transparent electrode ITO covered on a color film substrate of the display panel and a common electrode wiring arranged on the array substrate, and a voltage on the common electrode wiring is applied to the transparent electrode through a via hole. Therefore, the common electrode 11 may be a whole transparent electrode disposed on the color film substrate, or may be a plurality of common electrode traces disposed on the array substrate.

In this embodiment, the common voltage compensation device of the display panel includes a common voltage compensation unit 10, and the common voltage compensation unit 10 is disposed on the first side a of the display panel. The common voltage compensation unit 10 is a PCB board, and may be one or more, and is not limited herein.

In the present embodiment, the common voltage compensation device of the display panel further includes an initial voltage feedback line 120 and an initial voltage compensation line 130. The initial voltage feedback line 120 and the initial voltage compensation line 130 may be disposed at the second side B or the third side C, or disposed at both the second side B and the third side C, which is not limited herein. In this embodiment, the second side B and the third side C are simultaneously provided with the initial voltage feedback line 120 and the initial voltage compensation line 130, and by simultaneously monitoring and compensating the common voltage of the common electrode on both sides of the second side B and the third side C, the compensation efficiency is improved, and the occurrence of distortion is reduced.

Specifically, the initial voltage feedback line 120 and the initial voltage compensation line 130 are arranged in the column direction at the second side B and/or the third side C, one end of which extends to the common voltage compensation unit 10 of the first side a and is connected to the common voltage compensation unit 10, and the other end of which is connected to the common electrode 11 of the second side B and/or the third side C. Specifically, the common electrode 11 may be connected to any one or more positions of the second side B or the third side C, and is not limited herein. The initial voltage feedback line 120 monitors the common voltage of the common electrode of the second side B and/or the third side C of the display area 1, and feeds back the common voltage of the common electrode of the second side B and/or the third side C to the common voltage compensation unit 10, so that the common voltage compensation unit 10 obtains a compensation voltage according to the common voltage monitored by the initial voltage feedback line 120. The initial voltage compensation line 130 inputs a compensation voltage, which the common voltage compensation unit 10 derives from the common voltage fed back by the initial voltage feedback line 120, to the common electrode 11 of the second side B and/or the third side C to perform voltage compensation on the common electrode 11.

Wherein the second side B and the third side C are located at both sides of the first side a, and thus, the initial voltage feedback line 120 and the initial voltage compensation line 130 voltage-compensate the common electrode from both side edges of the second side B or the third side C of the display panel.

In this embodiment, the common voltage compensation device of the display panel further includes a voltage feedback line 12 and a voltage compensation line 13 disposed at the first side a, the voltage feedback line 12 and the voltage compensation line 13 being disposed away from the second side B and/or the third side C, that is, the voltage feedback line 12 and the voltage compensation line 13 being disposed near the middle of the display panel, the voltage feedback line 12 and the voltage compensation line 13 being connected to the common electrode 11, so that the common voltage of the common electrode in the region (middle region) of the display area 1 away from the second side B and/or the third side C is monitored and compensated at the first side a. In other words, the initial voltage feedback line 12 and the initial voltage compensation line 13 are positioned at the leftmost or rightmost side of the display panel, and the voltage feedback line 12 and the voltage compensation line 13 are positioned at the middle position of the display panel.

The beneficial effects of this embodiment are: by arranging one or more voltage feedback lines and voltage compensation lines at positions on the first side and far away from the second side or the third side, voltage compensation is performed on the common electrode close to the middle area of the display panel on the first side, and the occurrence of distortion condition of the voltage waveform of the common electrode in the middle area caused by voltage compensation or monitoring on the common electrode from the edges on two sides of the display panel is avoided.

In the first embodiment, the initial voltage feedback line 120 and the initial voltage compensation line 130 on the second side B and the third side C are connected to the common electrode 11 in the display area 1, as shown in fig. 2, and fig. 2 is a schematic structural diagram of an embodiment of fig. 1. The initial voltage feedback line 120 and the initial voltage compensation line 130 may be connected to the common electrode 11 at a plurality of positions on the second side B and the third side C, specifically, connected to the transparent electrode on the color film substrate or the common electrode trace on the array substrate through a via hole, which is not limited herein. In one embodiment, the common electrode of the display area 1 further includes a plurality of common electrode traces (as shown by dotted lines) arranged along the rows. The initial voltage feedback line 120 and the initial voltage compensation line 130 are connected with different common electrode wirings, so that the voltage compensation and monitoring of the common electrodes of different rows can be realized.

In the first embodiment, the voltage feedback line 12 and the voltage compensation line 13 may be one or a plurality of, and are not limited herein.

The disclosure further provides a common voltage compensation device of a second display panel, and referring to fig. 3, fig. 3 is a schematic structural diagram of a second embodiment of the common voltage compensation device of the display panel of the disclosure. In the second embodiment, the common voltage compensation device of the display panel includes a plurality of common voltage compensation units 10, the plurality of common voltage compensation units 10 are arranged in a row in parallel in the row direction, the plurality of common voltage compensation units 10 are disposed at intervals from each other, and various signals are respectively supplied to different areas of the display area 1 of the display panel. In the present embodiment, the display panel is divided into a plurality of areas controlled by different common voltage compensation units 10 by a plurality of common voltage compensation units 10.

Each common voltage compensation unit 10 comprises at least one voltage feedback line 12 and one voltage compensation line 13, that is, each region controlled by the common voltage compensation unit 10 comprises at least one voltage feedback line 12 and one voltage compensation line 13. In a preferred embodiment, the common voltage compensating units 10 should be uniformly distributed, and the pitch of each common voltage compensating unit 10 is the same.

In other embodiments, each common voltage compensation unit 10 may include one voltage feedback line 12 and a plurality of voltage compensation lines 13, which are not limited herein.

Wherein the common voltage compensation unit 10 is connected to the common electrode 11 of the display area 1 of the display panel through the flexible connection unit COF. Wherein each common voltage compensation unit 10 comprises at least one flexible connection unit COF.

In the second embodiment, the voltage feedback line 12 and the voltage compensation line 13 on each common voltage compensation unit 10 are connected to the common electrode 11 in the display panel through one of the flexible connection units COF.

In the third embodiment, referring to fig. 4 specifically, fig. 4 is a schematic structural diagram of a third embodiment of a common voltage compensation device of a display panel of the present application. Each flexible connection unit COF is provided with a voltage feedback line 12 and a voltage compensation line 13.

In the third embodiment, at least two flexible connection units COF are provided on each common voltage compensation unit 10, and the display panel is divided into a plurality of areas by the flexible connection units COF. The voltage feedback line 12 and the voltage compensation line 13 on each flexible connection unit COF correspond to the common electrode 11 controlling one of the areas.

It should be noted that the display panel further includes a plurality of data lines and scan lines, the scan lines are arranged along a row direction, the data lines are arranged along a column direction, and the scan lines are located on the first metal layer and the data lines are located on the second metal layer. In this application, the voltage feedback line 12 and the voltage compensation line 13 may be disposed at the same layer as the data line or at the same layer as the scan line. Preferably, the voltage feedback line 12 and the voltage compensation line 13 are disposed in the same layer as the data line, so that the voltage feedback line 12 and the voltage compensation line 13 do not intersect the data line and the scan line in a copper wiring layout.

Referring to fig. 5, fig. 5 is a schematic partial structure diagram of an embodiment of a common voltage compensation device of the display panel of the present application. As shown in fig. 5, the non-display area 2 of the display panel further includes a fan-out area F, and the fan-out area F has a trapezoid shape or an isosceles trapezoid shape. The side close to the display area 1 is a long side of a trapezoid, the side far from the display area 1 is a short side of the trapezoid, the voltage feedback line 12 and the voltage compensation line 13 are respectively arranged along two sides of the trapezoid, namely, extend from the side far from the display area 1 to the side close to the display area 1 and are arranged along the waist side of the fan-out area F, so that the voltage feedback line 12 and the voltage compensation line 13 are respectively input from two sides of the panel partition. Specifically, the voltage feedback line 12 is disposed along one side waist edge of the fan-out region F, and the voltage compensation line 13 is disposed along the other side waist edge of the fan-out region F, such that the voltage feedback line 12 and the voltage compensation line 13 are disposed along both side edges of the fan-out region F, respectively.

The application also provides a display panel, which comprises the common voltage compensation device of the display panel in any embodiment.

The application also provides a display device, which comprises the display panel. The display device may be: any product or component with display function such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device will be understood by those skilled in the art, and will not be described in detail herein.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of the patent application.

Claims

1. A common voltage compensation device of a display panel, the display panel comprising a display area and a non-display area, the display area being provided with a common electrode, the non-display area being arranged along the periphery of the display area, the non-display area comprising a first side arranged along a row direction, and a second side and a third side arranged opposite to each other along a column direction; the common voltage compensation device comprises a common voltage compensation unit arranged on the first side, and an initial voltage feedback line and an initial voltage compensation line which are arranged on the second side or the third side, and is characterized by further comprising a voltage feedback line and a voltage compensation line which are arranged on the first side, wherein the voltage feedback line and the voltage compensation line are far away from the second side and/or the third side and are connected with the common electrode so as to monitor and compensate the common voltage of the common electrode of the area of the display panel far away from the second side and/or the third side.

2. The common voltage compensation device of a display panel according to claim 1, wherein the initial voltage feedback lines are arranged in a column direction, one end of which extends to the common voltage compensation unit of the first side, and the other end of which is connected to the common electrode of the second side or the third side, so as to monitor the common voltage of the common electrode of the second side or the third side of the display panel, and feed back the common voltage on the common electrode of the second side and/or the third side to the common electrode compensation unit; one end of the initial voltage compensation line is connected with the public electrode of the second side or the third side, and the other end of the initial voltage compensation line is connected with the public voltage compensation unit so as to transmit compensation voltage obtained by the public voltage compensation unit according to the public voltage fed back by the initial voltage feedback line to the public electrode of the second side and/or the third side, so that voltage compensation is carried out on the public electrode.

3. The common voltage compensation device of a display panel according to claim 1, wherein the common voltage compensation unit includes a plurality of the common voltage compensation units arranged in parallel in a row direction;

wherein each common voltage compensation unit at least comprises one voltage feedback line and one voltage compensation line.

4. A common voltage compensation device for a display panel according to claim 1 or 3, wherein each of the common electrode compensation units comprises at least one flexible connection unit connecting the common electrode compensation unit and the common electrode of the display area.

5. The common voltage compensation device of a display panel according to claim 4, wherein one of the voltage feedback lines and one of the voltage compensation lines are provided on each of the flexible connection units, the voltage feedback lines and the voltage compensation lines being spaced apart.

6. The common voltage compensation device of a display panel according to claim 1, wherein the display panel further comprises a plurality of data lines and scan lines, the scan lines are arranged in a row direction, the data lines are arranged in a column direction, and the voltage feedback lines and the voltage compensation lines are disposed at the same layer as the data lines or at the same layer as the scan lines.

7. The device according to claim 1, wherein the non-display area of the display panel further comprises a fan-out area, the fan-out area is trapezoidal, a long side close to the display area is trapezoidal, a short side far from the display area is trapezoidal, and the voltage feedback line and the voltage compensation line are respectively arranged along two sides of the trapezoid.

8. The common voltage compensation device of claim 4, wherein the common voltage compensation unit is a PCB board and the flexible connection unit is a COF.

9. A display panel comprising the common voltage compensation device of any one of claims 1 to 8.

10. A display device comprising the display panel of claim 9.