KR20120133816A - Display driving system and Method for driver IC attachment thereon - Google Patents

Display driving system and Method for driver IC attachment thereon Download PDF

Info

Publication number
KR20120133816A
KR20120133816A KR1020110052676A KR20110052676A KR20120133816A KR 20120133816 A KR20120133816 A KR 20120133816A KR 1020110052676 A KR1020110052676 A KR 1020110052676A KR 20110052676 A KR20110052676 A KR 20110052676A KR 20120133816 A KR20120133816 A KR 20120133816A
Authority
KR
South Korea
Prior art keywords
driving chip
logs
glass substrate
display panel
log
Prior art date
Application number
KR1020110052676A
Other languages
Korean (ko)
Inventor
최정철
정기룡
김재민
Original Assignee
주식회사 실리콘웍스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 실리콘웍스 filed Critical 주식회사 실리콘웍스
Priority to KR1020110052676A priority Critical patent/KR20120133816A/en
Publication of KR20120133816A publication Critical patent/KR20120133816A/en

Links

Images

Classifications

    • 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
    • G02F1/13454—Drivers integrated on the active matrix substrate
    • 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
    • G02F1/13458—Terminal pads
    • 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

Abstract

The present invention is used to inspect the operation of the display panel before the driving chip is mounted, and after the inspection, a display board including the glass substrate and the glass substrate on which the multifunctional LOG is connected to the power pad of the mounted driving chip. Introduce the system. The display driving system includes a glass substrate, a display panel configured with a thin film transistor, at least one driving chip, and LOGs. Most of the glass substrate is occupied by the display panel, and a portion of the remaining glass substrate is formed with LOGs for transmitting various signals, and also driving chips are attached. The printed circuit board is attached to one end of the glass substrate. The driving chip receives a power supply voltage and a ground voltage applied from the printed circuit board through the pads. Some of the LOGs are test logs for checking whether the display panel is normally operated before the driving chip is attached, and others are LOGs for power supply voltage, ground voltage, and signal transmission for the driving chip and the pixel. Some of the test logs are connected to the supply voltage pads or ground voltage pads of the driving chip. This connection produces an effect of adding a path of the power supply voltage and the ground voltage to the driving chip, and also stabilizes the power supply voltage and the ground voltage of the driving chip.

Description

Display driving system and method for attaching driving chip {Display driving system and Method for driver IC attachment thereon}

The present invention relates to a display driving system in which a LOG is formed and a method of attaching a driving chip to a glass substrate. More specifically, the present invention relates to a technique of attaching LOGs used for inspecting pixels among LOGs formed on a glass substrate to a pad for power supply of a driving chip after the inspection is completed.

A display driving system is a display panel in which pixels are two-dimensionally arranged on a glass substrate, a plurality of driving chips attached to a glass substrate to drive the display panel, and attached to one end of the glass substrate to supply an electrical signal to the driving chip. It consists of various signal lines formed on the printed circuit board and the glass substrate.

The driving chips attached to the glass substrate are called chip on glass (COG), and the signal lines formed on the glass substrate are called line on glass (LOG). The LOG is a test log that checks whether the display panel is in normal operation, a power supply log that supplies power to a driving chip or display panel, a data log that delivers image data, and a control log that controls the transmission of image data. And the like.

On the other hand, as the size of the display panel increases day by day, the resolution also increases. As the increase in resolution is proportional to the absolute number of pixels, the number of data LOGs and other LOGs that provide image data to the pixels also increases, and the number of driving chips also increases rapidly. As a result, the area of glass substrates other than the display panel, which occupies most of the glass substrates, is extremely limited in increasing the number of other LOGs except data LOGs. In addition, this trend has been intensified in recent years as a large number of display panels in the form of chip on glass (COG) for directly attaching a driving chip directly onto a glass substrate are produced.

For example, the power supply LOG that supplies power to one driving chip has a limited area of glass substrate so that only one power supply LOG and one grounding LOG are allowed. Once connected, the rest of the drive chips would be cascaded. As a result, the level of the power supply voltage supplied to the driving chip is relatively reduced as it is far from the source, which greatly affects the operation of the driving chip.

Since the grounding LOG was the same, the grounding path for discharging the static charge generated inside the system was also limited, resulting in a decrease in the function and life of the display driving system.

On the other hand, before attaching the driving chip to the glass substrate, it is verified that the display panel works properly. In this case, inspection LOGs are used. As a result of the inspection, only the glass substrate on which the display panel works properly is subjected to the subsequent process. At this time, the inspection LOGs are no longer used for other purposes, and thus have a disadvantage of wasting the glass substrate.

The technical problem to be solved by the present invention is used to check the operation of the display panel before the driving chip is mounted on the glass substrate, and after the inspection is implemented a multi-functional LOG connected to the power supply pad of the mounted driving chip It is to provide a display drive system.

Another technical problem to be solved by the present invention is to test whether the display panel is operated before the driving chip is mounted, and after the inspection, attaching the driving chip to the display driving system to be connected to the power supply pad of the driving chip. To provide a method.

Display driving system according to the present invention for achieving the above technical problem, a printed circuit board for supplying an electrical signal is attached on the glass substrate, the display panel and the LOG for the electrical connection is formed, at least some of these LOG Used to test the operation of the display panel, at least some of the test logs include multi-functional LOGs that are connected to the power supply pads of the driving chip.

According to another aspect of the present invention, there is provided a method for attaching a driving chip of a display driving system according to the present invention, the method comprising: checking whether the display panel is normally operated by using a LOG; And electrical and mechanical bonding.

As described above, the display driving system according to the present invention uses some of the LOGs to check whether the display panel is operated before the driving chip is mounted on the glass substrate, and the display panel is normally When it is determined to operate, it can be used in various ways to supply power to the mounted driving chip, thereby maximizing the utilization of the glass substrate and adding a transfer path of power supplied to the driving chip. There is an advantage to stabilize the power supply.

When the multi-functional LOG is connected to the ground pad of the driving chip, resistance to electro-static discharge (ESD) of the display driving system may be improved.

1 is an overall schematic diagram of the present invention.
Figure 2 is an enlarged view of Figure 1 to show the configuration of the present invention in detail.
3 is a view for explaining a method for attaching the driving chip to the multi-functional LOG on the glass substrate in the present invention.

In order to fully understand the present invention and the operational advantages of the present invention and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings, which are provided for explaining exemplary embodiments of the present invention, and the contents of the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

The core idea of the present invention is that in the process of manufacturing a display driving system, a test log which is used only for inspecting the operation of the manufactured display panel and no longer useful after the inspection is used, and the driving chip is advantageous. It is to maximize the use efficiency of the LOG formed on the glass substrate by being used for supplying power or grounding the driving chip, that is, for power supply after being mounted on the board.

1 shows a display drive system according to the invention.

Referring to FIG. 1, the display driving system 100 according to the present invention includes a glass substrate 110, a display panel 120 occupying most of an area on the glass substrate, driving chips 131 to 133, and a printed circuit board ( PCB, Printed Circuit Board, 160). The printed circuit board (PCB) 160 is often a flexible printed circuit board (Flexible PCB). Here, only three driving chips 131 to 133 are omitted for convenience of description. In addition, the driving chips 131 to 133 may be either a gate driving chip for driving the gate of the pixel or a source driving chip for driving the column data line of the pixel, which is an essential feature of the present invention. It has no effect.

The display panel 120 is formed in almost all areas except a part of the edge of the glass substrate 110. Each pixel in the display panel 120 is formed of a thin film transistor (TFT) and a capacitor, is arranged two-dimensionally, and is connected to the driving chips 131 to 133 through a data log.

The driving chips 131 to 133 drive each pixel in the display panel 120 in line units in response to various signals applied from the PCB 160.

Since the configuration of the driving chip, the display panel, and their electrical operation characteristics are generally known, there is no problem in understanding the present invention even if the present invention is not described in detail. Also, for convenience, the data LOGs for the image signal of the pixel and the control LOGs for the control of the image signal are not shown or described in the drawings. Therefore, the following is mainly shown and described only for the LOG including the core idea of the present invention.

Between the driving chips 131 ˜ 133 and the printed circuit board 160, and between the driving chips 131 ˜ 133 and the display panel 120 through a plurality of LOGs 170 formed on the glass substrate 110. Electrically connected.

Since the LOG 170 has a constant width, the number of LOGs that can be implemented in the glass substrate 110 having a small area is limited. Since the LOG 170 serves as a transmission / reception path of signals in addition to the power used for operation and the ground (GND), the number of LOGs between the display panel 120 and the driving chips is quite large. In addition, a power supply LOG is required between the printed circuit board 160 and the driving chips 131 to 133 for supplying or grounding the driving chips 131 to 133, and also has a constant control signal and data signal. Similarly, a large number of LOGs are required because they must be passed.

In the present invention, the LOG, which is connected to the display panel 120 and used to inspect the operation, is later connected to the power supply pads of the driving chips 131 to 133, thereby maximizing the area utilization of the LOG. The detailed layout of will be shown in FIG.

2 is an enlarged view of a dotted line part of FIG. 1 in order to show the configuration of the present invention in detail. For electrical connection between the printed circuit board 160 and the driving chip 132, the plurality of LOG 170 is representative only the power supply LOG (170a) and multi-function LOG (170b) to explain the characteristic part of the present invention. In addition, the LOG for image data, the control LOG for controlling the image data, and the LOG used only for inspection are omitted. Inspection LOG is a LOG used for the purpose of inspecting whether pixel operation is normal. The multi-functional LOG 170b is a LOG used for additional power supply by being electrically and mechanically contacted with the power pad of the driving chip 132 after the inspection is completed among the inspection logs. The power pad of the driving chip 132 includes a power supply voltage pad and a ground voltage pad formed of metal.

 Before attaching the driving chip 132 to the glass substrate 110, whether each pixel constituting the display panel 120 operates normally is determined by an electrical inspection method through an inspection log. If the defective product in which the display panel 120 does not operate normally does not need to attach the driving chips 131 to 133 to the glass substrate 110. If the pixels operate normally as a result of the inspection, the driving chips 131 to 133 are attached.

At this time, the power pad 152 of the driving chip 132 is positioned in a pre-conceived position so as to be aligned with the multi-functional LOG 170b, which is a part of the LOG for inspection, to be connected mechanically and electrically. The position of the power pad 152 connected to the multifunction LOG 170b is advantageously disposed on the edge or short side of the driving chip 132. This is because the multifunction LOG 170b must be connected to the other driving chip 131 after passing through one driving chip 132, and there are many pads for data signals and control signals on the long side of the driving chip 132.

Other power pads 151 may already exist in the driving chip 132, and the pads 152 connected to the multifunction LOG 170b may be additionally added power pads. This addition creates an additional path through which each drive chip 132 is powered. If the added power path is a power voltage line, the glass substrate 110 The parasitic resistance of the extended power supply LOG is reduced by the number of additional paths. As a result, the power supply voltage of the driving chip farthest from the power supply voltage terminal of the printed circuit board 160 is minimized. appear. As shown in FIG. 2, the added power pads 152 may be advantageously disposed on the edge portion of the driving chips 132 or the short side of the driving chips 132.

The multifunction LOG 170b is used for inspection of the display panel through the output pad 153 when the switching means 154 formed on the multifunction LOG 170b is in an on state, and then the switching means 154 is used. In the off state it can be used for power supply.

The vertical structure and manufacturing process of the display driving system 100 will be described with reference to FIG. 3. Referring to FIG. 3, the display driving system 100 first forms a LOG pattern 170 on the glass substrate 110. The display panel 120, which has been already made on the formed LOG pattern 170, is aligned and mounted on the glass substrate 110. If the mounted display panel 120 is a defective product that does not operate normally, the process to be propelled afterwards is meaningless, and once the display panel 120 is mounted on the glass substrate 110, the display is performed using the LOG pattern 170. The operation of the panel 120 is first checked.

Although not shown in FIG. 3, referring to the structure of the display driving system 100 according to the present invention illustrated in FIG. 1, the operation test of the display panel 120 may include an operating voltage applied from the printed circuit board 160. This is performed by applying the ground voltage, the control signal, and the data signal to the display panel 120 through a LOG formed for inspection among the LOG patterns 170. For convenience, LOG, which is used only for inspection, is not shown. When it is determined that the display panel 120 does not operate normally as a result of the inspection, the inspected product is discarded to prevent cost loss due to additional work.

When it is determined that the display panel 120 operates normally, the driving chip 132 is mounted on the glass substrate 110. Since the driving chip 132 and the glass substrate 110 are made of different kinds of materials, a bonding material is required to bond them together, and a pattern made of a material used for bonding is referred to as a bump 140. do. The bumps are electrically conductive in addition to the function of bonding.

After the bumps 140 are formed on each of the pads 152 of the driving chip, the bumps 140 are aligned and bonded to the corresponding LOG. According to the manufacturing process, the driving chip 132 bonded to the glass substrate 110 is electrically connected to the printed circuit board 160 or the display panel 120 through a LOG formed at the bottom of the bumper and the bumper.

As described above, among the plurality of LOG patterns formed on the glass substrate 110, a LOG pattern which is used for the function test of the display panel 120 and also for supplying power to the pad of the driving chip 132 is selected. In order to distinguish it from the rest of the LOG, the present invention is defined as a multifunctional LOG. As described above with reference to FIG. 3, the vertical structure of FIG. 3 does not completely match the planar structure of FIG.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

100: display drive system 110: glass substrate
120: display panel 131 to 133: driving chip
140: bump 151: pad for power supply
152: pad for power supply for multi-function LOG 160: printed circuit board (PCB)
170: LOG (Line On Glass) 170a: power supply LOG
170b: Multifunctional LOG

Claims (5)

In a display driving system equipped with a printed circuit board and a display panel for supplying an electrical signal on a glass substrate formed with LOGs for electrical connection,
The LOGs include inspection LOGs used to inspect the operation of the display panel.
And at least one of the inspection LOGs is connected to a power supply pad of a driving chip. The method of claim 1,
The power supply pad includes at least one pad of a power voltage pad and a ground voltage pad of the driving chip. The method of claim 1,
And the power supply pad is disposed adjacent to an edge of the driving chip or a short side of the driving chip. The method of claim 1,
At least one of the inspection LOGs are connected to the power supply pad of the driving chip through a switching means. In a method of attaching a driving chip of a display driving system in which a printed circuit board for supplying an electrical signal is attached to a glass substrate, and a display panel and LOGs for electrical connection are formed.
Checking whether the display panel is normally operated using the LOGs; And
Adhering at least one pad of the power voltage pad and the ground voltage pad of the driving chip to the LOG of some of the LOGs.
KR1020110052676A 2011-06-01 2011-06-01 Display driving system and Method for driver IC attachment thereon KR20120133816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020110052676A KR20120133816A (en) 2011-06-01 2011-06-01 Display driving system and Method for driver IC attachment thereon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020110052676A KR20120133816A (en) 2011-06-01 2011-06-01 Display driving system and Method for driver IC attachment thereon

Publications (1)

Publication Number Publication Date
KR20120133816A true KR20120133816A (en) 2012-12-11

Family

ID=47517119

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020110052676A KR20120133816A (en) 2011-06-01 2011-06-01 Display driving system and Method for driver IC attachment thereon

Country Status (1)

Country Link
KR (1) KR20120133816A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160099985A (en) * 2015-02-13 2016-08-23 삼성디스플레이 주식회사 Driving integrated circuit chip and display device having a driving integrated circuit chip
KR20190012926A (en) * 2017-07-31 2019-02-11 엘지디스플레이 주식회사 Driver-ic and display device including the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160099985A (en) * 2015-02-13 2016-08-23 삼성디스플레이 주식회사 Driving integrated circuit chip and display device having a driving integrated circuit chip
KR20190012926A (en) * 2017-07-31 2019-02-11 엘지디스플레이 주식회사 Driver-ic and display device including the same

Similar Documents

Publication Publication Date Title
KR102631839B1 (en) Display device
CN107861658B (en) Display panel and display device
US9812084B2 (en) Display apparatus including a plurality of flexible printed circuit boards
KR101975865B1 (en) Display device
CN106201106B (en) A kind of touch-control display panel
EP3128504A1 (en) Mounting substrate and electronic device
KR101844431B1 (en) Flat panel display device and apparatus
US20080303755A1 (en) Organic light emitting display device and mother substrate thereof
JP2006106704A (en) Flat display panel and assembly process of driving device for the flat display panel
EP2133739A1 (en) Flat panel display apparatus and method of manufacturing the same
CN100461984C (en) Circuit assembling structure
US10426034B2 (en) Circuit substrate module and flexible display device
CN110416393B (en) Electronic device
KR20170081105A (en) Organic Light Emitting Diode Display Panel AND Organic Light Emitting Diode Display Device having the same
KR101996653B1 (en) Flat panel display device
KR20200119581A (en) Display panel and method of manufacturing thereof
KR101451770B1 (en) Display Driving Circuit
US8059249B2 (en) Flat panel display and chip bonding pad
US20090315459A1 (en) Organic light emitting display device
KR20120133816A (en) Display driving system and Method for driver IC attachment thereon
CN101388372A (en) Sector circuit construction, display panel and display device applying the same
KR20190079086A (en) Flexible display device
US9261742B2 (en) Display substrate, mother substrate for manufacturing the same and method of manufacturing the display substrate
KR20150061738A (en) Organic Light Emitting Display device
KR101621560B1 (en) Test pattern of Liquid crystal display device

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination