KR20080114319A - Liquid crystal display module, aging system of liquid crystal display module and aging method thereof - Google Patents

Liquid crystal display module, aging system of liquid crystal display module and aging method thereof Download PDF

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Publication number
KR20080114319A
KR20080114319A KR1020070063759A KR20070063759A KR20080114319A KR 20080114319 A KR20080114319 A KR 20080114319A KR 1020070063759 A KR1020070063759 A KR 1020070063759A KR 20070063759 A KR20070063759 A KR 20070063759A KR 20080114319 A KR20080114319 A KR 20080114319A
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KR
South Korea
Prior art keywords
liquid crystal
aging
crystal display
display module
voltage
Prior art date
Application number
KR1020070063759A
Other languages
Korean (ko)
Inventor
정종훈
Original Assignee
엘지디스플레이 주식회사
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Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020070063759A priority Critical patent/KR20080114319A/en
Publication of KR20080114319A publication Critical patent/KR20080114319A/en

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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
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing
    • 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
    • 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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)

Abstract

Disclosed is a liquid crystal display module capable of improving defect detection capability.

According to an exemplary embodiment of the present invention, a liquid crystal display module includes an aging unit configured to detect whether there is a defect by supplying an alternating voltage and a maximum voltage of a driving unit for driving the liquid crystal display panel in response to an aging signal input from the outside. .

Description

Liquid crystal display module, aging system of liquid crystal display module and its aging method {LIQUID CRYSTAL DISPLAY MODULE, AGING SYSTEM OF LIQUID CRYSTAL DISPLAY MODULE AND AGING METHOD THEREOF}

1 is a block diagram showing a liquid crystal display module according to an embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating the aging unit of FIG. 1. FIG.

3 is a flowchart illustrating operation of an aging system for a liquid crystal display module according to an embodiment of the present invention step by step.

<Description of the code for the main part>

110: liquid crystal display module 111: liquid crystal display panel

112: timing controller 113: gate driver

114: data driver 115: DC-DC converter

120: aging unit 121: control unit

122: aging voltage generator 123: selection unit

124: memory 125: timer

The present invention relates to a liquid crystal display module, and more particularly, to a liquid crystal display module, an aging system of the liquid crystal display module and an aging method thereof capable of improving defect detection capability.

In recent years, as the society enters the information age in earnest, the display field for visually expressing electrical information signals has been rapidly developed, and various flat panel display devices having excellent performance of thinning, light weight, and low power consumption have been developed. Panel display devices have been developed to quickly replace conventional cathode ray tubes (CRT).

Among the flat panel display devices, a liquid crystal display device displays an image by using a thin film transistor (TFT) as a switching element.

The manufacturing process of the liquid crystal display device includes substrate cleaning, substrate patterning, alignment film formation, substrate bonding / liquid crystal injection, mounting process, and the like.

In the substrate cleaning process, foreign substances on the substrates are removed using a cleaning agent before and after patterning of the upper and lower substrates (color filter / array substrate).

The substrate patterning process is divided into the patterning of the upper substrate (color filter substrate) and the patterning of the lower substrate (array substrate). A color filter, a common electrode, a black matrix and the like are formed on the upper substrate (color filter substrate). A signal line such as a data line and a gate line is formed on the lower substrate (array substrate), and a thin film transistor (TFT) is formed at the intersection of the data line and the gate line, and a drain electrode of the thin film transistor (TFT) is formed. The pixel electrode is formed in the pixel region between the data line and the gate line so as to be connected to the pixel line.

The alignment film forming process is performed through an alignment film printing process for forming an alignment film on an upper / lower substrate (color filter / array substrate), and an alignment film surface treatment process for forming polymer chains having directivity in a predetermined direction on the surface of the alignment film. An alignment film is formed.

In the substrate bonding / liquid crystal injection process, a bonding process using a seal material, a liquid crystal injection, and an injection hole encapsulation process are sequentially performed on an upper / lower substrate (color filter / array substrate).

In the mounting process, a liquid crystal display module is completed by connecting a tape carrier package (TCP) on which an integrated circuit such as a gate driver integrated circuit and a data driver integrated circuit is mounted, to a pad portion on a substrate.

The aging process is performed for the liquid crystal display module completed through the above manufacturing process.

The aging process of the liquid crystal display module detects a defect of the liquid crystal display module in an environment of high temperature / low temperature and high humidity.

However, the liquid crystal display module according to the related art has a problem that a defect of an integrated circuit occurs in addition to a defect in an environment of high temperature / low temperature and high humidity even when the aging process is performed.

The defect of the liquid crystal display module in which the aging process is completed may result in lowering the yield and deteriorating reliability from users.

An object of the present invention is to provide an aging system of a liquid crystal display module that can improve the defect detection ability of the liquid crystal display module.

It is an object of the present invention to provide an aging system of a liquid crystal display module that can improve the reliability of the edge.

Liquid crystal display module according to an embodiment of the present invention for achieving the above object,

A liquid crystal display panel; And

It includes an aging unit for detecting the presence or absence of a failure by supplying the rated voltage and the maximum voltage of the driving unit for driving the liquid crystal display panel in response to the aging signal input from the outside.

In addition, the aging system of the liquid crystal display module,

An aging voltage generator for generating a rated voltage and a maximum voltage for driving the liquid crystal display module;

A selection unit for switching any one of the rated voltage and the maximum voltage generated from the aging voltage generator; And

And a control unit controlling the selection unit so that the rated voltage and the maximum voltage are alternately supplied to the liquid crystal display module at regular time intervals.

In addition, the aging method of the liquid crystal display module,

Generating a rated voltage and a maximum voltage for aging the liquid crystal display module;

Selecting one of the rated voltage and the maximum voltage; And

And controlling the supply of the rated voltage and the maximum voltage to the liquid crystal display module alternately at regular time intervals.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a liquid crystal display module according to an embodiment of the present invention, Figure 2 is a block diagram showing an aging portion of FIG.

1 and 2, the liquid crystal display module 110 according to the exemplary embodiment of the present invention is provided with an aging unit 120 for aging.

First, the configuration of the liquid crystal display module 110 will be described in detail. The liquid crystal display module 110 includes a liquid crystal display panel 111 displaying an image and a plurality of gate lines GL1 to GLn on the liquid crystal display panel 111. ), A gate driver 113 for driving a plurality of data lines, a data driver 114 for driving a plurality of data lines DL1 to DLm on the liquid crystal display panel 111, and the gate and data drivers 113 and 114. And a DC-DC converter 115 for supplying driving voltages used for the timing controller 112, the gate driver 113, and the data driver 114.

The liquid crystal display panel 111 includes pixels formed in regions divided by a plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm, respectively. Each of the pixels includes a thin film transistor TFT formed at an intersection between corresponding gate lines GL1 to GLn and corresponding data lines DL1 to DLm, and between the thin film transistor TFT and the common electrode Vcom. The connected liquid crystal cell Clc is provided.

The thin film transistor TFT switches the pixel data voltage to be supplied to the corresponding liquid crystal cell Clc from the corresponding data lines DL1 to DLm in response to the gate scan signals on the corresponding gate lines GL1 to GLn. The liquid crystal cell Clc includes a common electrode facing each other with a liquid crystal layer interposed therebetween, and a pixel electrode connected to the thin film transistor TFT. The liquid crystal cell Clc charges the pixel data voltage supplied via the corresponding thin film transistor TFT. In addition, the voltage charged in the liquid crystal cell Clc is updated every time the corresponding thin film transistor TFT is turned on.

Each of the pixels on the liquid crystal display panel 111 includes a storage capacitor Cst. The storage capacitor Cst serves to minimize a natural decrease in the voltage charged in the liquid crystal cell Clc.

The gate driver 113 supplies a plurality of gate scan signals to the plurality of gate lines GL1 to GLn in response to the gate control signal from the timing controller 112. The plurality of gate scan signals cause the plurality of gate lines GL1 to GLn to be sequentially enabled for one horizontal synchronization signal.

The data driver 114 generates a plurality of pixel data voltages each time any one of the plurality of gate lines GL1 to GLn is enabled in response to data control signals from the timing controller 112 to display the liquid crystal display. The plurality of data lines DL1 to DLm on the panel 111 are respectively supplied. The data driver 114 inputs pixel data from the timing controller 112 one line at a time, and converts one line of pixel data into an analog pixel data voltage using a gamma voltage set.

The timing controller 112 is a data clock Dclk, a horizontal synchronization signal Hsync, and a vertical synchronization signal from an external system (e.g., a graphic module of a computer system or an image demodulation module of a television receiving system). Vsync) and the data enable signal DE are used to generate the gate control signals (GSP, GSC, GOE, etc.), the data control signals (DSP, DSC, DOE, etc.) and the polarity signal (POL). The gate control signals GSP, GSC, GOE, etc. are supplied to the gate driver 113, and the data control signals DSP, DSC, DOE, etc., and the polarity signal POL are supplied to the gate driver 114. do.

The DC-DC converter 115 uses a driving voltage supplied from a power supply (not shown) to common voltage Vcom, gate high voltage VGH, gate low voltage VGL, high potential common voltage Vdd, and low potential common. Convert to voltage Vcc. The converted voltages are supplied to the timing controller 112, the gate driver 113, and the data driver 114. In the present invention, an aging driving voltage input from the aging unit 120 is supplied to the DC-DC converter 115.

The liquid crystal display module 110 described above is subjected to an aging process after the assembly is completed. Although not shown in detail in the aging process, the liquid crystal display module 110 is loaded inside the aging chamber, the temperature and humidity are adjusted within the aging chamber, and the liquid crystal display module 110 is aged for a predetermined time. Supply the drive voltage.

The aging unit 120 of the present invention not only supplies an aging driving voltage for driving the liquid crystal display module 110 but also detects defects of a plurality of elements included in the liquid crystal display module 110 driving unit. The aging unit 120 may be mounted on a driving PCB of the liquid crystal display module 110. In the present invention, the case where the aging unit 120 is mounted on the driving PCB of the liquid crystal display module 110 will be described as an example.

The aging unit 120 includes a controller 121, an aging voltage generator 122, a selector 123, a timer 125, and a memory 124.

The controller 121 controls the selector 123, the timer 125, and the memory 124 in response to an aging enable signal (AE).

The aging voltage generator 122 generates a rated voltage (Vnormal) and a maximum voltage (Vmax) for aging the driver of the liquid crystal display module 10 in response to the aging enable signal AE and supplies the generated voltage to the selector 123. do.

The selector 123 supplies one of the rated voltage Vnormal and the maximum voltage Vmax supplied from the aging voltage generator 122 to the DC-DC converter 115 of the liquid crystal display module 110.

The selector 123 may be configured such that any one of the rated voltage Vnormal and the maximum voltage Vmax supplied from the aging voltage generator 122 is changed in response to the control signal of the controller 121. To be supplied.

The timer 125 detects an aging time of the liquid crystal display module 110. Specifically, the timer 125 detects an aging time based on the start time of the aging drive of the aging system.

The aging time detected from the timer 125 is stored in the memory 124.

The timer 125 stores the aging process time in the memory 124 based on the aging driving start time. The controller 121 controls the selector 123 according to the aging driving time stored in the memory 124. For example, when the aging process is performed for 2 hours, the aging system of the present invention supplies a rated voltage (Vnormal) to the liquid crystal display module 110 for 30 minutes on the basis of the aging start, and the time after 30 minutes has elapsed. As a reference, the maximum voltage Vmax is supplied to the liquid crystal display module 110 for one hour. In addition, the rated voltage Vnormal is measured for 30 minutes from the time when 1 hour and 30 minutes have elapsed since the aging process is started, that is, when 1 hour has passed since the maximum voltage Vmax was supplied to the liquid crystal display module 110. The liquid crystal display module 110 is supplied.

The liquid crystal display module 110 according to the exemplary embodiment of the present invention described above has a rated voltage and a limit value of the driving elements for detecting defects in the driving unit of the liquid crystal display module 110 as well as detecting defects in a high temperature / humidity environment. By alternately supplying the maximum voltage), it is possible to improve the defect detection capability of the liquid crystal display module 110.

Therefore, the liquid crystal display module 110 of the present invention can improve reliability by detecting the presence or absence of defective driving elements of the liquid crystal display module 100 during aging.

3 is a flowchart illustrating an operation of an aging system for a liquid crystal display module according to an embodiment of the present invention step by step.

As shown in FIG. 3, the aging system for an LCD according to an exemplary embodiment of the present invention is configured such that a liquid crystal display module is loaded inside an aging chamber and an aging driving voltage is input to a driving unit of the liquid crystal display module. After the aging enable signal is input, the aging process is started. The operational flow of the aging system will be described in detail in conjunction with FIG.

The aging enable signal AE is input to the controller and the aging voltage generator of the aging system of FIG. 2 (S100).

The aging voltage generating unit generates a rated voltage (Normal driving voltage) and a maximum voltage (Max driving voltage) of the driving devices for driving the liquid crystal display module in response to the aging enable signal AE. Here, the control unit controls to supply the rated voltage (Normal driving voltage) to the driving unit of the liquid crystal display module and the liquid crystal display panel from the time when the aging process starts (S200).

From the start of the aging process, the timer of the aging system detects the process time and stores it in the memory. The control unit supplies the rated voltage (Normal driving voltage) to the driving unit and the liquid crystal display panel of the liquid crystal display module until 30 minutes or more elapses after the aging process starts based on the aging process time stored in the memory. When 30 minutes or more have elapsed since the aging process is started, the controller controls the selector of FIG. 2 so that the maximum voltage (Max driving voltage) generated from the aging voltage generator is the driving unit and the liquid crystal display panel of the liquid crystal display module. To be supplied to (S400).

The controller controls the maximum voltage to the driving unit and the liquid crystal display panel of the liquid crystal display module until the maximum voltage (the maximum driving voltage) has elapsed for at least 1 hour from the time point at which the maximum voltage (Max driving voltage) starts to be supplied to the driving unit and the liquid crystal display panel of the liquid crystal display module. (S500) When the maximum voltage (Max driving voltage) starts to be supplied to the driving unit and the liquid crystal display panel of the liquid crystal display module, the controller selects the selection. The unit is controlled to supply the rated voltage (Normal driving voltage) generated from the aging voltage generator to the driving unit and the liquid crystal display panel of the liquid crystal display module.

The control unit is rated to the driving unit and the liquid crystal display panel of the liquid crystal display module until 30 minutes or more has elapsed based on the time when the rated voltage (normal driving answer) starts to be supplied to the driving unit and the liquid crystal display panel of the liquid crystal display module. The voltage Vnormal is supplied. (S700) When 30 minutes or more has elapsed from the time point at which the rated voltage (Normal driving voltage) starts to be supplied, the aging process is terminated.

The aging system of the liquid crystal display module according to an embodiment of the present invention supplies the rated voltage (Normal driving voltage) of the driving unit for driving the liquid crystal display module during the initial 30 minutes of the aging process, and then the maximum voltage (Max driving voltage) for 1 hour. ) And then aging the driving elements of the liquid crystal display module in a method of supplying a rated voltage (Normal driving voltage) for 30 minutes thereafter to detect whether there is a defect.

In the present invention, in the method of aging the driving elements of the liquid crystal display module during the aging process, alternately supplying the rated voltage (Normal driving voltage) or the maximum voltage (Max driving voltage) of the driving element at a predetermined time interval Although the description is limited to this, the present invention is not limited thereto, and the predetermined time can be changed.

Although not shown in the drawing, when a failure of the driving element of the liquid crystal display module occurs during the aging process described above, the liquid crystal display module is defectively processed.

The aging system of the liquid crystal display module of the present invention described above can detect not only a defect of the liquid crystal display module in a high temperature / high humidity environment but also a defect of the liquid crystal display module driver. That is, the present invention can detect the failure of the liquid crystal display module driver by alternately supplying the rated voltage and the maximum voltage of the driving elements for driving the liquid crystal display module at regular time intervals.

Therefore, the aging system of the liquid crystal display module according to the present invention can improve the reliability of the aging system by detecting whether the liquid crystal display module is defective in the driving elements at the time of aging.

As described above, the present invention, in the aging of the liquid crystal display module, by alternately supplying the rated voltage and the maximum voltage of the drive elements of the liquid crystal display module at regular time intervals, as well as a high temperature / high humidity environment as well as the liquid crystal display module There is an effect that can detect a failure of the drive elements for driving the.

The present invention has the effect of improving the reliability of the aging system by providing an aging system that can detect the failure of the driving elements of the liquid crystal display module.

Those skilled in the art through the above description will be capable of various changes and modifications without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (10)

A liquid crystal display panel; And And an aging unit for detecting whether there is a failure by supplying alternately the rated voltage and the maximum voltage of the driving unit for driving the liquid crystal display panel in response to an aging signal input from the outside. The method of claim 1, The aging unit, An aging voltage generator for generating a rated voltage and a maximum voltage for driving the liquid crystal display module; A selection unit for switching any one of the rated voltage and the maximum voltage generated from the aging voltage generator; And And a controller which controls the selection unit so that the rated voltage and the maximum voltage are alternately supplied to the liquid crystal display module at regular time intervals. The method of claim 1, The aging unit further comprises a timer for detecting an aging time and a memory for storing the aging time detected from the timer. An aging voltage generator for generating a rated voltage and a maximum voltage for driving the liquid crystal display module; A selection unit for switching any one of the rated voltage and the maximum voltage generated from the aging voltage generator; And And a control unit for controlling the selection unit so that the rated voltage and the maximum voltage are alternately supplied to the liquid crystal display module at predetermined time intervals. The method of claim 4, wherein The aging system further comprises a timer for detecting the aging time and a memory for storing the aging time detected from the timer. The method of claim 4, wherein The maximum voltage generated from the aging voltage generator is a limit driving voltage of the drive elements provided to drive the liquid crystal display module. Generating a rated voltage and a maximum voltage for aging the liquid crystal display module; Selecting one of the rated voltage and the maximum voltage; And And controlling the supply of the rated voltage and the maximum voltage to the liquid crystal display module alternately at regular time intervals. The method of claim 7, wherein The aging method of the liquid crystal display module, characterized in that it further comprises the step of detecting the aging time. The method of claim 7, wherein The method of claim 1, further comprising the step of storing the detected data. The method of claim 7, wherein The aging method of the liquid crystal display module, characterized in that the rated voltage and the maximum voltage are alternated for a predetermined time based on the detected aging time.
KR1020070063759A 2007-06-27 2007-06-27 Liquid crystal display module, aging system of liquid crystal display module and aging method thereof KR20080114319A (en)

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KR1020070063759A KR20080114319A (en) 2007-06-27 2007-06-27 Liquid crystal display module, aging system of liquid crystal display module and aging method thereof

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Application Number Priority Date Filing Date Title
KR1020070063759A KR20080114319A (en) 2007-06-27 2007-06-27 Liquid crystal display module, aging system of liquid crystal display module and aging method thereof

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