WO2018045837A1 - 补偿装置、显示装置和公共电极电压补偿方法 - Google Patents

补偿装置、显示装置和公共电极电压补偿方法 Download PDF

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Publication number
WO2018045837A1
WO2018045837A1 PCT/CN2017/094068 CN2017094068W WO2018045837A1 WO 2018045837 A1 WO2018045837 A1 WO 2018045837A1 CN 2017094068 W CN2017094068 W CN 2017094068W WO 2018045837 A1 WO2018045837 A1 WO 2018045837A1
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Prior art keywords
common electrode
compensation
display panel
metal layer
signal
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PCT/CN2017/094068
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English (en)
French (fr)
Inventor
王建军
闫龙
聂春扬
戴珂
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Priority to US15/767,391 priority Critical patent/US10916209B2/en
Publication of WO2018045837A1 publication Critical patent/WO2018045837A1/zh
Anticipated expiration legal-status Critical
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    • 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
    • G09G3/3655—Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • G—PHYSICS
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    • 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
    • G—PHYSICS
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    • 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
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136213—Storage capacitors associated with the pixel electrode
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode
    • G02F2201/121—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode common or background
    • G—PHYSICS
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    • 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
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
    • 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
    • G—PHYSICS
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    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • G—PHYSICS
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    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a display panel and a method of fabricating the same, a compensation device, a display device, and a common electrode (VCOM) voltage compensation method.
  • VCOM common electrode
  • Liquid crystal display has the advantages of low radiation, small size and low energy consumption, and is widely used in electronic products such as notebook computers, flat-panel televisions or mobile phones.
  • TFT-LCD thin film transistor liquid crystal display
  • one gate switching circuit is provided for each pixel, so that each pixel can be controlled relatively independently.
  • the common electrode (VCOM) voltage provides a common voltage for the pixel capacitance (Clc) and the storage capacitance (Cs) of each pixel, thereby providing a reference voltage for the substrate of the liquid crystal display.
  • Embodiments of the present disclosure provide a display panel and a method of fabricating the same, a compensation device, a display device, and a common electrode (VCOM) voltage compensation method, which are capable of improving VCOM stability and improving the effect of VCOM compensation.
  • VCOM common electrode
  • a display panel including at least one capacitance provided in an area other than an effective display area of the display panel such that a common electrode voltage of the display panel remains stable.
  • the capacitor may include a first metal layer connected to the common electrode input end of the display panel; an insulating layer disposed on the first metal layer; and a second metal layer, It is placed on the insulating layer and has a ground terminal.
  • the capacitor may include a first metal layer connected to the common electrode input end of the display panel; a first insulating layer disposed on the first metal layer; and a second insulating layer disposed On the first insulating layer; a third metal layer disposed on the second insulating layer and having a ground terminal.
  • the capacitor may include a first metal layer; a first insulating layer disposed on the first metal layer; and a second metal layer disposed on the first insulating layer and the display panel
  • the common electrode input is connected; the second insulating layer is disposed on the second metal layer; and the third metal layer is disposed on the second insulating layer.
  • the first metal layer and/or the third metal layer have a ground terminal.
  • the capacitor may include a first metal layer having a ground end; a first insulating layer disposed on the first metal layer; and a second insulating layer disposed on the first insulating layer a third metal layer disposed on the second insulating layer and coupled to the common electrode input of the display panel.
  • a compensation apparatus for a display panel comprising: a compensation module configured to input a signal according to a common electrode for supplying a common electrode voltage to a display panel and a common from the display panel An electrode feedback signal, generating a common electrode compensation signal for providing to the display panel; a comparison module configured to compare the common electrode compensation signal and the common electrode feedback signal; and an adjustment module configured to adjust the common according to the comparison result of the comparison module Electrode compensation signal.
  • the compensation module may include a first capacitor, a first resistor, a second resistor, an amplifier, and a second capacitor.
  • the first end of the first capacitor is provided with a common electrode feedback signal, and the second end is coupled to the first resistor.
  • a first end of the first resistor is coupled to the second end of the first capacitor, and a second end is coupled to the first input of the amplifier.
  • a first end of the second resistor is coupled to the first input of the amplifier and a second end is coupled to the output of the amplifier.
  • a first input of the amplifier is coupled to the second end of the first resistor and the first end of the second resistor, the second input being provided with a common electrode input signal and outputting a common electrode compensation signal.
  • the first end of the second capacitor is coupled to the second end of the first capacitor and the second end is coupled to ground.
  • the adjustment module is configured to increase a capacitance value of the second capacitance when the common electrode compensation signal is delayed from the common electrode feedback signal, and decrease when the common electrode compensation signal leads the common electrode feedback signal The capacitance value of the second capacitor.
  • the compensation rate of the compensation device varies according to different regions of the display panel.
  • the compensation rate of the compensation device is higher in a region where the rate of change of the voltage difference of the common electrode voltage with respect to time is higher than a region where the rate of change of the voltage difference of the common electrode voltage with respect to time is high.
  • a display device comprising: a display panel; a compensating device of the above; a plurality of common electrode input lines for inputting a common electrode input signal to the display panel; and a plurality of common electrode feedbacks a line for inputting a common electrode feedback signal from the display panel to the compensation device; and a plurality of common electrode compensation lines for inputting the common electrode compensation signal from the compensation device to the display panel.
  • an effective display area of the display panel is divided into a plurality of sub-areas, wherein compensation means are provided corresponding to each of the plurality of sub-areas, and compensation rates of the respective compensation means are based on the corresponding sub-areas in the display panel The location on the to set.
  • the compensation rates of the compensation devices provided at the sub-areas having the same distance from the central axis of the display panel are equal.
  • a common electrode voltage compensation method for the above display device is provided.
  • a common electrode input signal input to a display panel of a display device and a common electrode feedback signal from a display panel are provided, wherein the common electrode input signal provides a common electrode voltage.
  • a common electrode compensation signal is generated based on the acquired common electrode feedback signal and the common electrode input signal.
  • the common electrode compensation signal and the common electrode feedback signal are compared, and the common electrode compensation signal is adjusted based on the result of the comparison.
  • an effective display area of the display panel may be divided into a plurality of sub-areas, and a corresponding common electrode compensation signal is generated corresponding to each of the plurality of sub-areas.
  • a method of manufacturing a display panel in which at least one capacitor is formed in a region other than an effective display region of a display panel is provided.
  • forming the at least one capacitor includes: forming a first metal layer connected to the common electrode input end; forming an insulating layer on the first metal layer; and forming a second metal layer on the insulating layer thereon Form a ground terminal.
  • forming the at least one capacitor includes: forming a first metal layer connected to the common electrode input end; forming a first insulating layer on the first metal layer; and forming a second insulating layer on the first insulating layer a layer; a second metal layer is formed on the second insulating layer, and a ground end is formed thereon.
  • forming the at least one capacitor includes: forming a first metal layer; forming a first insulating layer on the first metal layer; forming a second metal layer on the first insulating layer, and inputting to the common electrode Connecting; forming a second insulating layer on the second metal layer; forming a third metal layer on the second insulating layer; wherein the ground is formed on the first metal layer and/or the third metal layer.
  • forming the at least one capacitor includes: forming a first metal layer and forming a ground end thereon; forming a first insulating layer on the first metal layer; forming a second insulating layer on the first insulating layer a layer; a third metal layer is formed on the second insulating layer and connected to the common electrode input end.
  • FIG. 1a is a schematic diagram of a display panel in accordance with an embodiment of the present disclosure
  • Figure 1b is a schematic block diagram of the display panel shown in Figure 1a;
  • Figure 2a is a schematic cross-sectional view of a first example of the capacitance of the display panel as shown in Figure 1a;
  • Figure 2b is a schematic cross-sectional view of a second example of the capacitance of the display panel as shown in Figure 1a;
  • Figure 2c is a schematic cross-sectional view of a third example of the capacitance of the display panel as shown in Figure 1a;
  • Figure 2d is a schematic cross-sectional view of a fourth example of the capacitance of the display panel as shown in Figure 1a;
  • FIG. 3 is a schematic block diagram of a compensation device in accordance with an embodiment of the present disclosure.
  • Figure 4a is an exemplary circuit diagram of a compensation module in the compensation device shown in Figure 3;
  • Figure 4b is a compensation circuit diagram for explaining the compensation module in an ideal case
  • Figure 5 is a diagram for explaining the relationship between the VCOM compensation signal and the VCOM feedback signal of the compensation module shown in Figures 4a and 4b;
  • FIG. 6 is a schematic diagram of a display device in accordance with an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of a display device according to another embodiment of the present disclosure.
  • FIG. 8 is a flowchart of a common electrode voltage compensation method according to an embodiment of the present disclosure.
  • Figure 9a is a flow chart of a process for fabricating the capacitor shown in Figure 2a;
  • Figure 9b is a flow chart of a process for fabricating the capacitor shown in Figure 2b;
  • Figure 9c is a flow chart of a process for fabricating the capacitor shown in Figure 2c;
  • Figure 9d is a flow chart of a process for fabricating the capacitor shown in Figure 2d.
  • VCOM Shift The common electrode pull (VCOM Shift), the change in the VCOM voltage, will affect the actual voltage applied to the pixel, which may result in afterimages.
  • VCOM Shift the change in the VCOM voltage
  • the VCOM pull resistance characteristic is not considered, and it is difficult to controllably adjust the VCOM compensation.
  • the power IC has a complicated structure and high cost.
  • the compensation effect is generally poor.
  • FIG. 1a shows a schematic diagram of a display panel 100 in accordance with an embodiment of the present disclosure.
  • An effective display area AA Active Area
  • FIG. 1b is a schematic block diagram of the display panel shown in Figure 1a.
  • the capacitor Cpanel is equivalent to the VCOM capacitor in Figure 1a, one end is connected to the VCOM input terminal, and the other end is grounded.
  • the capacitor Cpcb is a capacitor schematically shown on a printed circuit board (PCB) outside the display panel, and likewise, one end thereof is connected to the VCOM input terminal and the other end is grounded.
  • Capacitors Cpanel and Cpcb are both configured to filter the VCOM input signal provided to the display panel to improve the stability of the VCOM voltage.
  • the capacitor Cpanel ie, VCOM capacitor
  • the capacitor Cpanel is relatively close to the effective display area AA of the display panel, so that when the VCOM input signal is filtered, the generated line loss is reduced, which can be achieved. Better filtering results.
  • the load capacity and the pull-resistance characteristic of the common electrode inside the display panel can be improved, thereby remarkably improving the stability of the VCOM voltage.
  • the VCOM capacitor described above can be constructed without changing the existing TFT manufacturing process. Specifically, when manufacturing the array substrate, the VCOM capacitor described above is constructed by using a metal layer and an insulating layer existing inside the display panel in a vacant area at the edge of the fan-out area of the display panel. Since the effective display area is coated with the sealant, the VCOM capacitor can use various structures such as full cover or mesh, and the mesh structure can improve the curing ability of the sealant.
  • FIGS 2a-2d show schematic cross-sectional views of four examples of the VCOM capacitors shown in Figure 1a, each employing a 2-layer metal/3-layer metal configuration, as described below.
  • the VCOM capacitor includes a first metal layer (Metal 1), a first insulating layer (Insulator 1) disposed on the first metal layer, and a second metal layer (Metal) disposed on the first insulating layer. 2).
  • the first metal layer is connected to the VCOM input terminal, and the second metal layer has a ground terminal GND.
  • the VCOM capacitor includes a first metal layer (Metal 1), a first insulating layer (Insulator 1) disposed on the first metal layer, and a second insulating layer disposed on the first insulating layer. (Insulator 2), and a third metal layer (Metal 3) disposed on the second insulating layer.
  • the first metal layer is connected to the VCOM input terminal, and the second metal layer has a ground terminal GND.
  • the VCOM capacitor includes a first metal layer (Metal 1), a first insulating layer (Insulator 1) disposed on the first metal layer, and a second metal layer (Metal 2) disposed on the first insulating layer. a second insulating layer (Insulator 2) disposed on the second metal layer, and a third metal layer (Metal 3) disposed on the second insulating layer.
  • the second metal layer is connected to the VCOM input terminal, and the first metal layer and/or the third metal layer has a ground terminal GND.
  • the VCOM capacitor includes a first metal layer (Metal 1), a first insulating layer (Insulator 1) disposed on the first metal layer, and a second insulating layer disposed on the first insulating layer (Insulator 2) And a third metal layer (Metal 3) disposed on the second insulating layer.
  • the third metal layer is connected to the VCOM input terminal, and the first metal layer has a ground terminal GND.
  • a gate switching element such as a field effect transistor (MOSFET) on a display panel
  • a gate thereof may be formed on the first metal layer
  • a source/drain may be formed on the second metal layer.
  • the first metal layer, the second metal layer, and the third metal layer are composed of a metal material such as molybdenum, aluminum, an aluminum-nickel alloy, a nickel-tungsten alloy, copper, or the like, a first insulating layer and a second
  • the insulating layer is composed of an insulating material such as silicon nitride, a mixture of silicon nitride and silicon oxynitride, or the like.
  • the VCOM capacitor is constructed using an existing production process, and has a simple structure and is easy to manufacture.
  • a VCOM voltage is input to the display panel, and a VCOM signal inside the display panel is taken out to a VCOM feedback point by setting a collection point to obtain a VCOM feedback signal.
  • the VCOM feedback signal is amplified by the amplifier and then passed through the VCOM compensation module to obtain the VCOM compensation signal, and the VCOM compensation signal is input into the display panel to compensate for the change of the VCOM voltage inside the display panel.
  • FIG. 3 shows a schematic block diagram of a compensation device 300 in accordance with an embodiment of the present disclosure.
  • the compensation device 300 can include a compensation module 310, a comparison module 320, and an adjustment module 330.
  • the compensation module 310 can be under the control of the VCOM input signal and the VCOM feedback signal.
  • a VCOM compensation signal is generated for supply to the display panel.
  • the comparison module 320 is configured to compare the phase difference between the VCOM compensation signal and the VCOM feedback signal.
  • the adjustment module 330 is configured to adjust the compensation module 310 according to the result of the above comparison, thereby adjusting the VCOM compensation signal, thereby reducing the phase difference between the two.
  • the compensation module 310, the comparison module 320, and the adjustment module 330 may be implemented as a combination of a processor and a memory, wherein the processor executes a program stored in the memory to implement the functions of the corresponding module.
  • the modules described herein may also be implemented in hardware implementations, including application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), etc., or in a combination of hardware and software.
  • FIG. 4a shows an exemplary circuit diagram of the compensation module 310 in the compensation device 300 shown in FIG.
  • the compensation module 310 can include a first capacitor C1, a first resistor R1, a second resistor R2, an amplifier OA, and a second capacitor C2.
  • the first end of the first capacitor C1 is supplied with a VCOM feedback signal, and the second end is connected to the first end of the first resistor R1 for isolating DC noise.
  • the first end of the first resistor R1 is connected to the second end of the first capacitor C1, and the second end is connected to the first input end of the amplifier OA.
  • the first end of the second resistor R2 is connected to the first input of the amplifier OA, and the second end is connected to the output of the amplifier OA.
  • the first input of the amplifier OA is connected to the second end of the first resistor R1, the second input is provided with a VCOM input signal, and the output terminal outputs a first VCOM compensation signal.
  • the first end of the second capacitor C2 is connected to the second end of the first capacitor C1, and the second end is connected to the ground.
  • the first input of the amplifier OA may be an inverting input, and the second input may be a positive input.
  • Figure 4b shows a compensation circuit diagram for illustrating the standard compensation module 410 in an ideal situation.
  • the standard compensation module 410 can generate a standard VCOM compensation signal under the control of the VCOM input signal and the VCOM feedback signal.
  • the basic structure is the same as that of the compensation module 310 in FIG. 4b, except that the standard compensation module 410 does not have the second capacitor C2, and the rest is not described again.
  • the ideal parameters of each of the above elements can be obtained by calculation, so that the calculated parameters can be used to correspondingly set the components of the compensation module 310 of Fig. 4a.
  • the capacitance values of the first capacitors C1 of the two compensation modules may be different or the same.
  • a compensating device is used to generate a VCOM for canceling the pull of the VCOM feedback signal.
  • the signal is compensated to improve the stability of the VCOM voltage.
  • the VCOM compensation signal has the same magnitude and opposite magnitude and the same phase as the VCOM feedback signal, ie there is no delay between the two.
  • the compensation device 300 shown in FIG. 3 will be described in detail below with reference to FIGS. 4a, 4b and 5.
  • the standard VCOM compensation signal (see FIG. 5) generated by the standard compensation module 410 can be assumed to be a VCOM compensation signal in an ideal state, which has the same phase as the VCOM feedback signal, ie, no time delay.
  • the phase of both the VCOM compensation signal and the VCOM feedback signal is observed and compared by a comparison module 320, such as an oscilloscope.
  • the VCOM compensation signal is adjusted by the adjustment module 330 or manually adjusting the capacitance value of the second capacitor C2 in the compensation module 310 in real time, thereby reducing the phase difference between the two.
  • the VCOM compensation signal with delay is adjusted to the assumed standard VCOM compensation signal.
  • the adjusted VCOM compensation signal approximates the standard VCOM compensation signal, and inputting it to the display panel can more effectively reversely compensate the VCOM voltage, and speed up the compensation and improve the compensation effect.
  • the magnification of the amplifier OA in the compensation module 310 can also be used as the compensation rate of the compensation device 310.
  • the compensation rate of the compensation device 310 may vary according to different regions of the display panel. Specifically, the compensation rate of the compensation device is higher in a region where the voltage difference of the VCOM voltage with respect to time (that is, the recovery rate of the VCOM pull) is higher than a region where the voltage difference of the VCOM voltage is higher with respect to time.
  • the magnification of the amplifier OA it is also possible to correct the amplitude of the compensation signal, thereby improving the compensation effect. Specifically, increasing the magnification of the amplifier OA increases the compensation signal The amplitude of the amplifier OA is reduced, and the amplitude of the compensation signal is reduced.
  • FIG. 6 shows a schematic diagram of a display device 600 in accordance with one embodiment of the present disclosure.
  • the display device 600 includes a display panel 110 (similar to the display panel 100 described above, with only a change in the position and number of VCOM capacitors), the compensation device 300 as described above, and a plurality of VCOM input lines 610 ( Shown by thin solid lines), a plurality of VCOM feedback lines 620 (shown by thick solid lines) and a plurality of VCOM compensation lines 630 (shown by dashed lines).
  • each VCOM input line 610 is connected to a VCOM input point on the display panel 110 and is configured to input a VCOM input signal, ie, a VCOM voltage, to the display panel 110, thereby being pixels of the display panel 110. Provide a reference voltage.
  • VCOM input line 610 is also coupled to an input of compensation device 300 to provide a VCOM input signal to compensation device 300.
  • a plurality of sampling points are disposed on the display panel 110, such as at the center of the effective display area AA of the display panel, relative to the proximal or distal end of the effective display area AA.
  • the VCOM feedback signal at the sampling point is transmitted to an input of the compensation device 300 via the VCOM feedback line 620.
  • each VCOM compensation line 630 is connected to the output end of the compensation device 300, and the other end is connected to a VCOM compensation point (on the VCOM BAR) on the display panel 110 to be compensated.
  • the VCOM compensation line 630 is a dedicated thicker VCOM line with less line loss. Therefore, the VCOM compensation signal from the compensation device 300 can be input to the display panel 110 to reverse-compensate it at each VCOM compensation point, that is, to cancel the pull of a similar VCOM feedback signal.
  • the display device 600 As described above, it is possible to improve the pull-resistant characteristics of the VCOM voltage and to control the VCOM voltage compensation variably. Therefore, the stability of the VCOM voltage can be improved and the speed of the VCOM voltage compensation can be accelerated.
  • the VCOM voltage difference of different regions is different with respect to time, that is, the recovery rate of the VCOM pull is different.
  • the recovery rate around the display panel is high and the central recovery rate is low. Therefore, it will affect the compensation effect of the VCOM voltage.
  • FIG. 7 shows a schematic diagram of a display device 700 using a sub-region compensation method of another embodiment of the present disclosure.
  • the effective display area AA of the display panel is divided into It is M sub-areas, and the corresponding VCOM voltage reverse compensation is performed for each sub-area.
  • the compensating device 300 as described above is constructed separately.
  • the VCOM voltage of each sub-area is observed by a device such as an oscilloscope to obtain a recovery rate of VCOM pull of each sub-area.
  • the VCOM feedback signal and the VCOM input signal are respectively input to the input terminal of the corresponding compensation device 300, for example, by adjusting the peripheral circuit to adjust the gain of the amplifier OA in each compensation device 300.
  • the gain of amplifier OA can be considered as the compensation rate of the compensation device. That is to say, different compensation rates are set for the corresponding compensation devices 300 of each sub-area to effectively control the recovery rate of the VCOM pull.
  • the gain of the amplifier OA that is, increasing the compensation rate of the compensation device
  • reducing the gain of the amplifier OA that is, reducing the compensation rate of the compensation device
  • the delay of each VCOM compensation signal and the VCOM feedback signal is reduced, thereby more effectively performing reverse compensation for each sub-region.
  • the VCOM compensation signals of the sub-areas of the display panel respectively compensate the corresponding sub-areas in reverse, and different compensation rates and different compensation delays are adopted for the edge and the center to obtain better compensation effects.
  • the effective display area of the display panel is centered on its center, and the M sub-areas are axially symmetrically disposed on the left and right sides.
  • the display panel effective area includes a plurality of sub-areas such as a first sub-area, a N-th sub-area, an M-th sub-area, and the like.
  • FIG. 8 shows a flow chart of a VCOM voltage compensation method in accordance with an embodiment of the present disclosure.
  • the compensation module acquires a VCOM input signal input to a display panel of the display device by using a VCOM input line, and acquires a VCOM feedback signal from a sampling point of the display panel by using a VCOM feedback line, wherein the VCOM input signal provides a common electrode voltage.
  • the sampling point can be a central sampling point, a near-end sampling point, or a remote sampling point.
  • step S820 on The compensation module generates a VCOM compensation signal according to the VCOM feedback signal and the VCOM input signal, and provides the VCOM compensation signal to the VCOM compensation point in the display panel to be compensated by a dedicated thicker VCOM compensation line, thereby canceling a similar VCOM feedback signal. Pulling.
  • step S830 the phases of the VCOM compensation signal and the VCOM feedback signal are compared using the comparison module described above. In step S840, based on the result of the comparison, the VCOM compensation signal is adjusted by the adjustment module to be in phase with the VCOM feedback signal, thereby improving the effect of reverse compensation on the display panel.
  • the VCOM voltage compensation method further includes dividing the display panel effective display area into a plurality of sub-areas, and generating a corresponding VCOM compensation signal corresponding to each of the plurality of sub-areas.
  • Figures 9a-9d show a flow chart of a process for fabricating a VCOM capacitor as shown in Figures 2a-2d. Both of them use the existing metal layer and the insulating layer to construct the VCOM capacitor at the edge of the fan-out area of the display panel, which is described in detail below.
  • step S910 a first metal layer is formed and connected to the VCOM input terminal.
  • step S912 an insulating layer is formed on the first metal layer.
  • step S914 a second metal layer is formed on the insulating layer, and a ground terminal GND is formed thereon.
  • a first metal layer is formed and connected to the VCOM input.
  • a first insulating layer is formed on the first metal layer.
  • a second insulating layer is formed on the first insulating layer.
  • a second metal layer is formed on the second insulating layer, and a ground terminal GND is formed thereon.
  • a first metal layer is formed.
  • a first insulating layer is formed on the first metal layer.
  • a second metal layer is formed on the first insulating layer and connected to the VCOM input terminal.
  • a second insulating layer is formed on the second metal layer.
  • a third metal layer is formed on the second insulating layer. The ground terminal GND is formed on the second metal layer and/or the third metal layer.
  • step S940 a first metal layer is formed, and a ground terminal GND is formed thereon.
  • step S942 a first insulating layer is formed on the first metal layer.
  • step S944 a second insulating layer is formed on the first insulating layer. Forming a third metal layer on step S946 and combining it with The VCOM input is connected.

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Abstract

一种补偿装置（300）、显示装置（600、700）和公共电极电压补偿方法。该补偿装置（300）用于显示面板（100、110），其包括补偿模块（310）、比较模块（320）和调节模块（330）。补偿模块（310）根据用于向显示面板（100、110）提供公共电极电压的公共电极输入信号和来自显示面板（100、110）的公共电极反馈信号，生成公共电极补偿信号，以提供给显示面板（100、110）。比较模块（320）比较公共电极补偿信号和公共电极反馈信号。调节模块（330）根据比较模块（320）的比较结果，调节公共电极补偿信号。

Description

补偿装置、显示装置和公共电极电压补偿方法
相关申请的交叉引用
本申请要求于2016年9月9日递交的中国专利申请第201610812444.4号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开涉及显示技术领域，具体地，涉及显示面板及其制作方法、补偿装置、显示装置和公共电极(VCOM)电压补偿方法。
背景技术
液晶显示器(Liquid Crystal Display，简称LCD)具有低辐射、体积小及低耗能等优点，被广泛地应用在笔记本电脑、平面电视或移动电话等电子产品中。在薄膜晶体管液晶显示器(TFT-LCD)中，针对每个像素设置一个栅极开关电路，从而可以相对独立地控制各个像素。公共电极(VCOM)电压为各个像素的像素电容(Clc)和存储电容(Cs)提供公共电压，从而为液晶显示器的基板提供参考电压。
发明内容
本公开的实施例提供了一种显示面板及其制作方法、补偿装置、显示装置和公共电极(VCOM)电压补偿方法，其能够提高VCOM稳定性，并提高VCOM补偿的效果。
根据本公开的一个方面，提供了一种显示面板，其包括被设置在显示面板的有效显示区域以外的区域的至少一个电容，以使得显示面板的公共电极电压保持稳定。
在本公开的实施例中，电容可包括第一金属层，其与显示面板的公共电极输入端连接；绝缘层，其被设置在第一金属层上；以及第二金属层， 其被设置在绝缘层上，并具有接地端。
在本公开的实施例中，电容可包括第一金属层，其与显示面板的公共电极输入端连接；第一绝缘层，其被设置在第一金属层上；第二绝缘层，其被设置在第一绝缘层上；第三金属层，其被设置在第二绝缘层上，并具有接地端。
在本公开的实施例中，电容可包括第一金属层；第一绝缘层，其被设置在第一金属层上；第二金属层，其被设置在第一绝缘层上，并与显示面板的公共电极输入端连接；第二绝缘层，其被设置在第二金属层上；第三金属层，其被设置在第二绝缘层上。第一金属层和/或第三金属层具有接地端。
在本公开的实施例中，电容可包括第一金属层，其具有接地端；第一绝缘层，其被设置在第一金属层上；第二绝缘层，其被设置在第一绝缘层上；第三金属层，其被设置在第二绝缘层上，并与显示面板的公共电极输入端连接。
根据本公开的另一方面，提供了一种用于显示面板的补偿装置，包括：补偿模块，其被配置为根据用于向显示面板提供公共电极电压的公共电极输入信号和来自显示面板的公共电极反馈信号，生成公共电极补偿信号，以提供给显示面板；比较模块，其被配置为比较公共电极补偿信号和公共电极反馈信号；调节模块，其被配置为根据比较模块的比较结果，调节公共电极补偿信号。
在本公开的实施例中，补偿模块可包括第一电容、第一电阻、第二电阻、放大器和第二电容。第一电容的第一端被提供公共电极反馈信号，第二端与第一电阻连接。第一电阻的第一端与第一电容的第二端连接，第二端与放大器的第一输入端连接。第二电阻的第一端与放大器的第一输入端连接，第二端与放大器的输出端连接。放大器的第一输入端与第一电阻的第二端和第二电阻的第一端连接，第二输入端被提供公共电极输入信号，并输出公共电极补偿信号。第二电容的第一端与第一电容的第二端连接，第二端连接到地。
在本公开的实施例中，调节模块被配置为当公共电极补偿信号相比公共电极反馈信号滞后时，提高第二电容的电容值，当公共电极补偿信号相比公共电极反馈信号超前时，降低第二电容的电容值。
在本公开的实施例中，补偿装置的补偿率根据显示面板的不同区域而变化。
在本公开的实施例中，补偿装置的补偿率在公共电极电压的电压差相对于时间的变化率低的区域高于在公共电极电压的电压差相对于时间的变化率高的区域。
根据本公开的另一方面，提供了一种显示装置，包括：显示面板；以上的一种补偿装置；多条公共电极输入线，用于向显示面板输入公共电极输入信号；多条公共电极反馈线，用于将来自显示面板的公共电极反馈信号输入到补偿装置；多条公共电极补偿线，用于将来自补偿装置的公共电极补偿信号输入到显示面板。
在本公开的实施例中，显示面板的有效显示区域被划分为多个子区域，其中，与多个子区域的每个对应地设置补偿装置，各个补偿装置的补偿率基于对应的子区域在显示面板上的位置来设置。
在本公开的实施例中，与显示面板的中心轴距离相等的子区域处设置的补偿装置的补偿率相等。
根据本公开的另一方面，提供了用于以上的显示装置的公共电极电压补偿方法。在该方法中，获取向显示装置的显示面板输入的公共电极输入信号和来自显示面板的公共电极反馈信号，其中，公共电极输入信号提供公共电极电压。基于所获取的公共电极反馈信号和公共电极输入信号，生成公共电极补偿信号。然后，比较公共电极补偿信号和公共电极反馈信号，并基于所述比较的结果，调节公共电极补偿信号。
在本公开的实施例中，显示面板的有效显示区域可被划分为多个子区域，并且对应于多个子区域的每个子区域生成相应的公共电极补偿信号。
根据本公开的另一方面，提供了一种显示面板的制造方法，其中，在显示面板的有效显示区域以外的区域形成至少一个电容。
在本公开的实施例中，形成至少一个电容包括：形成第一金属层，其与公共电极输入端连接；在第一金属层上形成绝缘层；在绝缘层上形成第二金属层，其上形成接地端。
在本公开的实施例中，形成至少一个电容包括：形成第一金属层，其与公共电极输入端连接；在第一金属层上形成第一绝缘层；在第一绝缘层上形成第二绝缘层；在第二绝缘层上形成第二金属层，其上形成接地端。
在本公开的实施例中，形成至少一个电容包括：形成第一金属层；在第一金属层上形成第一绝缘层；在第一绝缘层上形成第二金属层，并与公共电极输入端连接；在第二金属层上形成第二绝缘层；在第二绝缘层上形成第三金属层；其中，第一金属层和/或第三金属层上形成接地端。
在本公开的实施例中，形成至少一个电容包括：形成第一金属层，并在其上形成接地端；在第一金属层上形成第一绝缘层；在第一绝缘层上形成第二绝缘层；在第二绝缘层上形成第三金属层，并与公共电极输入端连接。
附图说明
为了更清楚地说明本公开的技术方案，下面将对实施例的附图进行简单说明。应当知道，以下描述的附图仅仅是本公开的一些实施例，而非对本公开的限制，其中：
图1a是根据本公开的实施例的显示面板的示意图；
图1b是如图1a所示的显示面板的示意框图；
图2a是如图1a所示的显示面板的电容的第一示例的示意性截面图；
图2b是如图1a所示的显示面板的电容的第二示例的示意性截面图；
图2c是如图1a所示的显示面板的电容的第三示例的示意性截面图；
图2d是如图1a所示的显示面板的电容的第四示例的示意性截面图；
图3是根据本公开的实施例的补偿装置的示意性框图；
图4a是如图3所示的补偿装置中的补偿模块的示例性电路图；
图4b是用于说明理想情况下的补偿模块的补偿电路图；
图5是用于说明图4a和图4b所示的补偿模块的VCOM补偿信号与VCOM反馈信号之间的关系的示意图；
图6是根据本公开的一个实施例的显示装置的示意图；
图7是根据本公开的另一个实施例的显示装置的示意图；
图8是根据本公开的实施例的公共电极电压补偿方法的流程图；
图9a是用于制造图2a所示的电容的过程的流程图；
图9b是用于制造图2b所示的电容的过程的流程图；
图9c是用于制造图2c所示的电容的过程的流程图；
图9d是用于制造图2d所示的电容的过程的流程图。
具体实施方式
为了使本公开的实施例的目的、技术方案和优点更加清楚，下面将结合附图，对本公开的实施例的技术方案进行清楚、完整的描述。显然，所描述的实施例仅仅是本公开的一部分实施例，而并非全部的实施例。基于所描述的实施例，本领域的普通技术人员在无需创造性劳动的前提下所获得的所有其它实施例，也都属于本公开的范围。
公共电极拉动(VCOM Shift)，即VCOM电压的变化，将影响施加在像素上的实际电压，从而可能产生残影。随着显示器分辨率的提高，以及对显示器显示品质的要求的提高，通常需要通过对VCOM电压补偿来提升VCOM电压的稳定性。
然而在现有的VCOM电压补偿技术中，并未考虑VCOM耐拉动特性，而且难以可控地调整VCOM补偿。虽然可以通过时序控制器(TCON)等，使用主动的VCOM电压输入来补偿，但是功率集成电路(Power IC)结构复杂，成本高昂。此外，在VCOM电压差变化较小的一段，补偿效果一般较差。
图1a示出了根据本公开的实施例的显示面板100的示意图。在显示面板100的中央设置了有效显示区域AA(Active Area)，并且在显示面板的有效显示区域AA以外的区域，即显示面板的扇出区(Fan Out)边缘，相 应地设置多个VCOM电容。
同时参见图1b，其相当于图1a所示的显示面板的示意性框图。其中，电容Cpanel相当于图1a中的VCOM电容，其一端连接到VCOM输入端，另一端接地。此外，电容Cpcb为示意性地示出在显示面板外的印刷电路板(PCB)上的电容，同样，其一端连接到VCOM输入端，而另一端接地。电容Cpanel和Cpcb均被配置为对向显示面板提供的VCOM输入信号进行滤波，进而可以提升VCOM电压的稳定性。
如果仅采用电容Cpcb对VCOM输入信号滤波，由于电容Cpcb距离显示面板相对较远，其间的线路将产生损耗，从而影响滤波的效果。另一方面，在显示面板上所布置的电容Cpanel(即，VCOM电容)距离显示面板的有效显示区域AA相对较近，因此在对VCOM输入信号滤波时，降低了所产生的线路损耗，可以达到更好的滤波效果。通过这种方法，可以提高显示面板内部的公共电极的负载能力和耐拉动特性，从而显著改进VCOM电压的稳定性。
进一步，可以在不改变现有TFT制造工艺的条件下，构造以上所述的VCOM电容。具体地，在制造阵列基板时，在显示面板的扇出区边缘的空余区域，采用显示面板内部已有的金属层和绝缘层来构造以上所述的VCOM电容。由于有效显示区域周围被涂覆有封框胶，所以VCOM电容可以使用全部覆盖或网状等多种结构，其中网状等结构可以提升封框胶固化能力。
图2a-2d示出了图1a所示的VCOM电容的四种示例的示意性截面图，其分别采用2层金属/3层金属的配置，具体描述如下。
如图2a所示，VCOM电容包括第一金属层(Metal 1)、设置在第一金属层上的第一绝缘层(Insulator 1)、以及设置在第一绝缘层上的第二金属层(Metal 2)。在本公开的实施例中，第一金属层与VCOM输入端连接，并且第二金属层上具有接地端GND。
如图2b所示，VCOM电容包括第一金属层(Metal 1)、设置在第一金属层上的第一绝缘层(Insulator 1)、设置在第一绝缘层上的第二绝缘层 (Insulator 2)、以及设置在第二绝缘层上的第三金属层(Metal 3)。在本公开的实施例中，第一金属层与VCOM输入端连接，并且第二金属层上具有接地端GND。
如图2c所示，VCOM电容包括第一金属层(Metal 1)、设置在第一金属层上的第一绝缘层(Insulator 1)、设置在第一绝缘层上的第二金属层(Metal 2)、设置在第二金属层上的第二绝缘层(Insulator 2)、以及设置在第二绝缘层上的第三金属层(Metal 3)。在本公开的实施例中，第二金属层与VCOM输入端连接，并且第一金属层和/或第三金属层上具有接地端GND。
如图2d所示，VCOM电容包括第一金属层(Metal 1)、设置在第一金属层上的第一绝缘层(Insulator 1)、设置在第一绝缘层上的第二绝缘层(Insulator 2)、以及设置在第二绝缘层上的第三金属层(Metal 3)。在本公开的实施例中，第三金属层与VCOM输入端连接，并且第一金属层上具有接地端GND。
进一步，对于显示面板上的诸如场效应晶体管(MOSFET)的栅极开关元件，其栅极可被构造在第一金属层上，源/漏极可被构造在第二金属层上。在本公开的实施例中，第一金属层、第二金属层和第三金属层由诸如钼、铝、铝镍合金、镍钨合金、铜等的金属材料构成，第一绝缘层和第二绝缘层由诸如氮化硅、氮化硅与氮氧化硅的混合物等的绝缘材料构成。
如上所述，利用现有生产工艺构造VCOM电容，结构简单，易于制造。
在本公开的实施例中，向显示面板输入VCOM电压，并通过设定采集点将显示面板内部的VCOM信号引出至VCOM反馈点，以得到VCOM反馈信号。VCOM反馈信号经放大器放大后再通过VCOM补偿模块，以获得VCOM补偿信号，将VCOM补偿信号输入至显示面板内部，从而补偿显示面板内部VCOM电压的变化。
图3示出了根据本公开的实施例的补偿装置300的示意性框图。如图3所示，补偿装置300可包括补偿模块310、比较模块320和调节模块330。其中，补偿模块310可在VCOM输入信号和VCOM反馈信号的控制下， 生成VCOM补偿信号，以提供给显示面板。比较模块320被配置为比较VCOM补偿信号与VCOM反馈信号的相位差。调节模块330被配置为根据以上比较的结果，调整补偿模块310，进而调整VCOM补偿信号，从而减小两者之间的相位差。
在本公开的实施例中，补偿模块310、比较模块320和调节模块330可以实现为处理器和存储器的组合，其中处理器执行存储器中存储的程序以实现相应模块的功能。本文中描述的模块也可以采用硬件实施方式实现，包括专用集成电路(ASIC)、现场可编程门阵列(FPGA)等，或者使用软硬件结合的形式实现。
图4a示出了图3所示的补偿装置300中的补偿模块310的示例性电路图。补偿模块310可包括第一电容C1、第一电阻R1、第二电阻R2、放大器OA和第二电容C2。第一电容C1的第一端被提供VCOM反馈信号，第二端与第一电阻R1的第一端连接,用于隔离直流噪声。第一电阻R1的第一端与第一电容C1的第二端连接，第二端与放大器OA的第一输入端连接。第二电阻R2的第一端与放大器OA的第一输入端连接，第二端与放大器OA的输出端连接。放大器OA的第一输入端与第一电阻R1的第二端连接，第二输入端被提供VCOM输入信号，输出端输出第一VCOM补偿信号。第二电容C2的第一端与第一电容C1的第二端连接，第二端连接接地。其中，放大器OA的第一输入端可以是反向输入端，第二输入端可以是正向输入端。
图4b示出了用于说明理想情况下的标准补偿模块410的补偿电路图。其中，标准补偿模块410可在VCOM输入信号和VCOM反馈信号的控制下，生成标准VCOM补偿信号。其基本结构与图4b中的补偿模块310相同，区别在于标准补偿模块410不具有第二电容C2，其余不再赘述。通过计算可分别获得上述每个元件的理想参数，因此可利用所计算的参数来对应地设置图4a中补偿模块310的各元件。其中，两个补偿模块的第一电容C1的电容值可以不同，也可以相同。
通常，采用补偿装置来产生用于抵消VCOM反馈信号的拉动的VCOM 补偿信号，来提高VCOM电压的稳定性。理想情况下，VCOM补偿信号与VCOM反馈信号具有大小相同且方向相反的幅值、以及相同的相位，即两者之间无延迟。然而，现实情况中由于制造工艺、线路损耗等原因，VCOM反馈信号与VCOM补偿信号之间通常存在相位差，即时间延迟，这将影响补偿的效果。
下面结合图4a、图4b和图5，对如图3所示的补偿装置300进行详细描述。如上所述，标准补偿模块410所生成的标准VCOM补偿信号(参见图5)可被假定为理想状态下的VCOM补偿信号，其与VCOM反馈信号具有相同的相位，即无时间延迟。另一方面，补偿模块310所生成的VCOM补偿信号(参见图5)与VCOM反馈信号之间通常存在延迟。也就是说，VCOM补偿信号与标准VCOM补偿信号之间存在相位差。
通过诸如示波器的比较模块320观测并比较VCOM补偿信号与VCOM反馈信号两者的相位。通过调节模块330或实时地手动调节补偿模块310中的第二电容C2的电容值，来调整VCOM补偿信号，从而减小两者之间的相位差。换句话说，将具有延迟的VCOM补偿信号调节到假定理想的标准VCOM补偿信号。具体地，当VCOM补偿信号相比VCOM反馈信号滞后时，提高第二电容C2的电容值，从而使延迟变短；当VCOM补偿信号相比VCOM反馈信号超前时，降低第二电容C2的电容值，从而使延迟变长。因此，经过调整的VCOM补偿信号近似于标准VCOM补偿信号，将其输入到显示面板，可以更有效地反向补偿VCOM电压，并且加快补偿的速度并提高补偿的效果。
此外，补偿模块310中的放大器OA的倍率也可作为补偿装置310的补偿率。在本公开的实施例中，补偿装置310的补偿率可根据显示面板的不同区域而变化。具体地，补偿装置的补偿率在VCOM电压的电压差相对于时间的变化率(即，VCOM拉动的恢复速率)低的区域高于在VCOM电压的电压差相对于时间的变化率高的区域。
此外，对放大器OA的倍率进行调节，还可以校正补偿信号的幅值，从而提高补偿的效果。具体地，提高放大器OA的倍率，则增大补偿信号 的幅值；而降低放大器OA的倍率，则将减小补偿信号的幅值。
图6示出了根据本公开的一个实施例的显示装置600的示意图。如图6所示，显示装置600包括显示面板110(类似于如上所述的显示面板100，仅VCOM电容的位置和数量有变化)、如上所述的补偿装置300、多条VCOM输入线610(由细实线示出)、多条VCOM反馈线620(由粗实线示出)以及多条VCOM补偿线630(由虚线示出)。
在本公开的实施例中，每条VCOM输入线610与显示面板110上的VCOM输入点连接，并且被配置为向显示面板110输入VCOM输入信号，即VCOM电压，从而为显示面板110的各像素提供参考电压。此外，VCOM输入线610还与补偿装置300的一个输入端连接，以向补偿装置300提供VCOM输入信号。
在显示面板110上设置多个采样点，例如在显示面板的有效显示区域AA中央、相对于有效显示区域AA的近端或远端处。通过VCOM反馈线620将采样点处的VCOM反馈信号传送到补偿装置300的一个输入端。
每条VCOM补偿线630的一端与补偿装置300的输出端连接，另一端与显示面板110上需要补偿的VCOM补偿点(VCOM BAR上)连接。VCOM补偿线630为专用的较粗的VCOM线，线路损耗较小。因此，可以将来自补偿装置300的VCOM补偿信号输入到显示面板110，从而在各VCOM补偿点对其进行反向补偿，即抵消类似VCOM反馈信号的拉动。
采用如上所述的显示装置600既可以改进VCOM电压的耐拉动特性，又可以可调地控制VCOM电压补偿。因此，可以提高VCOM电压的稳定性，并且加快VCOM电压补偿的速度。
另一方面，通过观察可发现，对于显示面板，不同区域的VCOM电压差相对于时间的变化率不同，即VCOM拉动的恢复速率不同。具体地，显示面板四周的恢复速率较高，中央恢复速率较低。因此，将影响VCOM电压的补偿效果。
图7示出了使用本公开的另一实施例的分区域补偿方法的显示装置700的示意图。在本公开的实施例中，将显示面板的有效显示区域AA分 为M个子区域，并对每个子区域进行相应的VCOM电压反向补偿。
具体地，针对每个子区域，分别构造如上所述的补偿装置300。通过诸如示波器的装置来观测各子区域的VCOM电压，以获得各子区域的VCOM拉动的恢复速率。将VCOM反馈信号与VCOM输入信号分别输入到相应的补偿装置300的输入端，例如通过调整外围电路，来调整各补偿装置300中的放大器OA的增益。放大器OA的增益可被视为补偿装置的补偿率。也就是说，对各子区域相应的补偿装置300设置不同的补偿率，来有效地控制VCOM拉动的恢复速率。具体地，提高放大器OA的增益，即提高补偿装置的补偿率，将使VCOM拉动的恢复速率提高；降低放大器OA的增益，即降低补偿装置的补偿率，将使VCOM拉动的恢复速率降低。另一方面，通过调整各子区域相应的补偿装置300的第二电容C2，减小各VCOM补偿信号与VCOM反馈信号的延迟，从而更有效地对各子区域进行反向补偿。根据以上所述，显示面板的各子区域的VCOM补偿信号分别对相应的子区域进行反向补偿，实现边缘与中央采用不同的补偿率以及不同的补偿延迟，获得更好的补偿效果。
在本公开的实施例中，显示面板的有效显示区域以其中心为轴，左右两侧轴对称地设置M个子区域。具体地，显示面板有效区包括诸如第1子区域、第N子区域、第M子区域等的多个子区域。其中，M和N为自然数，并且M＝2N。因此，可对第1子区域和第M子区域设置相同的补偿装置，对第2子区域和第M-1子区域设置相同的补偿装置，对第N子区域和第N+1子区域设置相同的补偿装置。其它设置类似，不再赘述。从而可以设置1至N种不同的补偿装置，获得1至N种不同的VCOM补偿信号，以达到更好的补偿效果。
图8示出了根据本公开的实施例的VCOM电压补偿方法的流程图。在步骤S810，上述补偿模块利用VCOM输入线获取向显示装置的显示面板输入的VCOM输入信号，以及利用VCOM反馈线获取来自显示面板的采样点的VCOM反馈信号，其中该VCOM输入信号提供公共电极电压，而该采样点可以是中央采样点、近端采样点或远端采样点。在步骤S820，上 述补偿模块根据上述VCOM反馈信号和VCOM输入信号，生成VCOM补偿信号，通过专用的较粗的VCOM补偿线将该VCOM补偿信号提供至显示面板中需要补偿的VCOM补偿点，从而抵消类似VCOM反馈信号的拉动。在步骤S830，利用上述比较模块比较VCOM补偿信号和VCOM反馈信号的相位。在步骤S840，基于该比较的结果，通过上述调节模块来调节VCOM补偿信号，使其与VCOM反馈信号相位相同，从而改进对显示面板反向补偿的效果。
在本公开的实施例中，VCOM电压补偿方法进一步包括：将显示面板有效显示区域分为多个子区域，并且对应于多个子区域的每个子区域生成相应的VCOM补偿信号。
图9a-9d示出了用于制造如图2a-2d所示的VCOM电容的过程的流程图。其均是在显示面板的扇出区边缘利用已有的金属层和绝缘层来构造VCOM电容，详细描述如下。
如图9a所示，在步骤S910，形成第一金属层，并将其与VCOM输入端连接。在步骤S912，在第一金属层上形成绝缘层。在步骤S914，在绝缘层上形成第二金属层，并在其上形成接地端GND。
如图9b所示，在步骤S920，形成第一金属层，并将其与VCOM输入端连接。在步骤S922，在第一金属层上形成第一绝缘层。在步骤S924，在第一绝缘层上形成第二绝缘层。在步骤S926，在第二绝缘层上形成第二金属层，并在其上形成接地端GND。
如图9c所示，在步骤S930，形成第一金属层。在步骤S932，在第一金属层上形成第一绝缘层。在步骤S934，在第一绝缘层上形成第二金属层，并将其与VCOM输入端连接。在步骤S936，在第二金属层上形成第二绝缘层。在步骤S938，在第二绝缘层上形成第三金属层。其中在第二金属层和/或第三金属层上形成接地端GND。
如图9d所示，在步骤S940，形成第一金属层，并在其上形成接地端GND。在步骤S942，在第一金属层上形成第一绝缘层。在步骤S944，在第一绝缘层上形成第二绝缘层。在步骤S946上形成第三金属层，并将其与 VCOM输入端连接。
以上对本公开的若干实施方式进行了详细描述，但本公开的保护范围并不限于此。显然，对于本领域的普通技术人员来说，在不脱离本公开的精神和范围的情况下，可以对本公开的实施例进行各种修改、替换或变形。本公开的保护范围由所附权利要求限定。

Claims (15)

  1. 一种用于显示面板的补偿装置，包括：
    补偿模块，其被配置为根据用于向所述显示面板提供公共电极电压的公共电极输入信号和来自所述显示面板的公共电极反馈信号，生成公共电极补偿信号，以提供给所述显示面板；
    比较模块，其被配置为比较所述公共电极补偿信号和所述公共电极反馈信号；以及
    调节模块，其被配置为根据所述比较模块的比较结果，调节所述公共电极补偿信号。
  2. 根据权利要求1所述的补偿装置，其中，所述补偿模块包括：第一电容、第一电阻、第二电阻、放大器和第二电容；
    其中，所述第一电容的第一端被提供所述公共电极反馈信号，第二端与所述第一电阻连接；
    所述第一电阻的第一端与所述第一电容的第二端连接，第二端与所述放大器的第一输入端连接；
    所述第二电阻的第一端与所述放大器的所述第一输入端连接，第二端与所述放大器的输出端连接；
    所述放大器的所述第一输入端与所述第一电阻的第二端和所述第二电阻的第一端连接，第二输入端被提供所述公共电极输入信号，并输出所述公共电极补偿信号；
    所述第二电容的第一端与所述第一电容的第二端连接，第二端连接到地。
  3. 根据权利要求2所述的补偿装置，其中，
    所述调节模块被配置为当所述公共电极补偿信号相比所述公共电极反馈信号滞后时，提高所述第二电容的电容值，当所述公共电极补偿信号相比所述公共电极反馈信号超前时，降低所述第二电容的电容值。
  4. 根据权利要求1所述的补偿装置，其中，所述补偿装置的补偿率根据所述显示面板的不同区域而变化。
  5. 根据权利要求4所述的补偿装置，其中，所述补偿装置的补偿率在所述公共电极电压的电压差相对于时间的变化率低的区域高于在所述公共电极电压的电压差相对于时间的变化率高的区域。
  6. 根据权利要求1至5中的任一项所述的补偿装置，其中，所述显示面板包括：
    至少一个电容，其被设置在所述显示面板的有效显示区域以外的区域，以使得所述显示面板的公共电极电压保持稳定。
  7. 根据权利要求6所述的显示面板，其中，所述电容包括：
    第一金属层，其与所述显示面板的公共电极输入端连接；
    绝缘层，其被设置在所述第一金属层上；以及
    第二金属层，其被设置在所述绝缘层上，并具有接地端。
  8. 根据权利要求6所述的显示面板，其中，所述电容包括：
    第一金属层，其与所述显示面板的公共电极输入端连接；
    第一绝缘层，其被设置在所述第一金属层上；
    第二绝缘层，其被设置在所述第一绝缘层上；
    第三金属层，其被设置在所述第二绝缘层上，并具有接地端。
  9. 根据权利要求6所述的显示面板，其中，所述电容包括：
    第一金属层；
    第一绝缘层，其被设置在所述第一金属层上；
    第二金属层，其被设置在所述第一绝缘层上，并与所述显示面板的公共电极输入端连接；
    第二绝缘层，其被设置在所述第二金属层上；
    第三金属层，其被设置在所述第二绝缘层上；
    其中，所述第一金属层和/或所述第三金属层具有接地端。
  10. 根据权利要求6所述的显示面板，其中，所述电容包括：
    第一金属层，其具有接地端；
    第一绝缘层，其被设置在所述第一金属层上；
    第二绝缘层，其被设置在所述第一绝缘层上；
    第三金属层，其被设置在所述第二绝缘层上，并与所述显示面板的公共电极输入端连接。
  11. 一种显示装置，包括:
    显示面板；
    如权利要求1至10中的任一项所述的补偿装置；
    多条公共电极输入线，用于向所述显示面板输入公共电极输入信号；
    多条公共电极反馈线，用于将来自所述显示面板的公共电极反馈信号输入到所述补偿装置；
    多条公共电极补偿线，用于将来自所述补偿装置的公共电极补偿信号输入到所述显示面板。
  12. 根据权利要求11所述的显示装置，其中，所述显示面板的有效显示区域被划分为多个子区域，
    其中，与所述多个子区域的每个对应地设置所述补偿装置，各个所述补偿装置的补偿率基于对应的子区域在所述显示面板上的位置来设置。
  13. 根据权利要求12所述的显示装置，其中，与显示面板的中心轴距离相等的子区域处设置的补偿装置的补偿率相等。
  14. 一种用于权利要求11至13中的任一项所述的显示装置的公共电极电压的补偿方法，包括：
    获取向所述显示装置的显示面板输入的公共电极输入信号和来自所述显示面板的公共电极反馈信号，其中，所述公共电极输入信号提供公共电极电压；
    基于所述公共电极反馈信号和所述公共电极输入信号，生成公共电极补偿信号；
    比较所述公共电极补偿信号和所述公共电极反馈信号；以及
    基于所述比较的结果，调节所述公共电极补偿信号。
  15. 根据权利要求14所述的方法，其中，
    所述显示面板的有效显示区域被划分为多个子区域，以及
    对应于所述多个子区域的每个子区域生成相应的公共电极补偿信号。
PCT/CN2017/094068 2016-09-09 2017-07-24 补偿装置、显示装置和公共电极电压补偿方法 Ceased WO2018045837A1 (zh)

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