CN104678621A - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
- Publication number
- CN104678621A CN104678621A CN201510133837.8A CN201510133837A CN104678621A CN 104678621 A CN104678621 A CN 104678621A CN 201510133837 A CN201510133837 A CN 201510133837A CN 104678621 A CN104678621 A CN 104678621A
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- China
- Prior art keywords
- terminal
- brilliant film
- liquid crystal
- terminals
- high voltage
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- Legal status (The legal status 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 status listed.)
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Classifications
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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
-
- 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
- G02F1/13452—Conductors connecting driver circuitry and terminals of panels
-
- 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
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention provides a liquid crystal display device. Multiple types of terminals are respectively arranged on a chip on film, a circuit board and a liquid display panel; one end of each terminal of the chip on film is connected with the corresponding terminal on the circuit board; the other end of each terminal of the chip on film is connected with the corresponding terminal on the liquid display panel; the distance s between each two adjacent terminals is the same; one terminal is a high-voltage terminal; the horizontal width D of the high-voltage terminal is larger than the horizontal widths d of other terminals; the horizontal widths d of other terminals are the same; the horizontal width D of the high-voltage terminal is equal to the sum of the sum of the horizontal widths of other n (n is larger than or equal to 2) adjacent terminals and the sum of the distances between few terminals, i.e. D is equal to nd plus (n-1)s. According to the liquid crystal display device, a manner of reducing the impedance at the connecting part is adopted, so that under the conditions without reducing high-voltage shutdown current or changing wiring on other positions, the heat produced by the current is reduced and can be released as soon as possible, and the probability on damaging the chip on film is reduced.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator solving power off afterimage phenomenon and all opened by TFT when display panels is closed.
Background technology
TFT-LCD liquid crystal indicator is when shutdown, if electric charge residual in pixel can not be released in time, " tide " phenomenon can be produced, namely in the time that the several seconds after power-off is even longer, display can not forward OFF state at once by ON state, but gradually change, this phenomenon is referred to as power off afterimage phenomenon.The reason producing this phenomenon is, LCD scanning line is successively opened, and the time of at every turn opening is very short, therefore when shutting down, the electric charge remained in inside pixel can not be released by data line in time in time.Be illustrated in figure 1 the schematic diagram of power off afterimage phenomenon, often the state of black (normally black) panel, when shutdown is, when changing to black state from white state, the power off afterimage phenomenon of generation.
For improving this phenomenon, TFT can be added in scan drive circuit and all open (All-Output-on) circuit, as shown in Figure 2, when shutting down, high voltage VGH is added to TFT grid G ate (n) 10, all TFT switches 30 are all opened simultaneously, in time electric charge remaining in pixel is released by data line Source (m) 20, overall picture also has identical voltage and GTG, thus eliminates power off afterimage phenomenon.
But open TFT switch simultaneously and need very large high voltage VGH surge current, produce very large heat, burn and cover brilliant film (COF:Chip On Flex, or, Chip On Film, IC is fixed in flexible circuit board) but adopt this way, shutdown can be made to produce very large VGH surge current instantaneously, as Fig. 3 be normal display and shutdown time voltage oscillogram, Fig. 4 is VGH electric current during shutdown and contrast test figure when normally showing, when in liquid crystal display, it normally shows, liquid crystal panel interscan line successively opens, as long as the VGH required for each like this TFT of opening is applied on 1 sweep trace, and this action time is very short.Such as, resolution is 1366*768 resolution, and refreshing frequency is the liquid crystal display of 60 hertz, and the time of at every turn opening TFT is no more than 1/768*60=21.7 microsecond (us); And in shutdown moment, the TFT quantity that open is 768, and opening time can be millisecond (ms) level.
Be called that source electrode covers brilliant film 1, is called that grid covers brilliant film 2 at the brilliant film that covers in grid direction at the brilliant film that covers in source electrode direction.
Big current during shutdown can produce a large amount of heats on the path that it flows through, on source electrode direction, source electrode covers that the position that brilliant film 1 contacts with circuit board 3 is the first contact position 4, to cover brilliant film 1 be the second contact position 5 with the contact position of panel end cabling 4 to source electrode, the formula of shutdown current generates heat:
Q＝I
2RT
Wherein, Q refers to the heat that shutdown electric current produces, and VGH electric current I-VGH when I refers to shutdown, R refers to the impedance on current path, the time that T refers to as.
Cover at source electrode the first contact position 4 that brilliant film 1 contacts with circuit board 3, the second contact position 5 that source electrode covers brilliant film 1 and the contact of panel end cabling 4, because it is by ACF (anisotropic conductive, Anisotropic Con ductive Film, be called for short: ACF) connect, as shown in Figure 4 and Figure 5, because impedance is comparatively large, can accumulate a lot of heat instantaneously in shutdown by big current, easily damage source electrode covers brilliant film 1.
Circuit board is golden finger (connecting finger) on circuit board with covering position that brilliant film is connected, is called circuit board golden finger.
Circuit board golden finger with cover brilliant film and be connected, the connection covering brilliant film and liquid crystal panel side terminal is all connected by the terminal on pin position, as shown in Figure 6, the pin position of circuit board golden finger 3, cover the pin position of brilliant film 1, the pin position of liquid crystal panel side 2 is all provided with some pin terminals, comprise: low-voltage VGL terminal 4, supply voltage VCC terminal 5, high voltage VGH terminal 6, ground voltage GND terminal 7, each terminal has several, in the present embodiment, often kind of terminal all has three, the width of all terminals and interval are all identical, Fig. 6 just illustrates the schematic diagram of several terminal.
The two ends that source electrode covers the low-voltage pin terminals 4 of brilliant film 1 are connected with the low-voltage pin terminals 4 of circuit board golden finger 3 and the low-voltage pin terminals 4 of display panels 2 respectively, the two ends that source electrode covers the supply voltage pin terminals 5 of brilliant film 1 are connected with the supply voltage pin terminals 5 of circuit board golden finger 3 and the supply voltage pin terminals 5 of liquid crystal panel side 2 respectively, the two ends that source electrode covers the high-voltage pin terminal 6 of brilliant film 1 are connected with the high-voltage pin terminal 6 of circuit board golden finger 3 and the high-voltage pin terminal 6 of LCD panel 2 respectively, the two ends that source electrode covers the ground voltage pin terminals 7 of brilliant film 1 are connected with the ground voltage pin terminals 7 of circuit board golden finger 3 and the high ground voltage pin terminals 7 of liquid crystal panel side 2 respectively.
In order to reduce the accumulation of heat, have two kinds of modes, one reduces VGH inrush current value, and a kind of is reduce the resistance value on current path.If VGH inrush current value during restriction shutdown, in fact VGH can be made can not to be applied to the grid of TFT fully, namely can not open fully at shutdown moment TFT, the residual charge in pixel can not very fast discharging, and can decrease to the solution effect of power-off ghost shadow.
Summary of the invention
The invention provides a kind of liquid crystal indicator solving shutdown image retention.
The invention provides a kind of liquid crystal indicator, it comprises display panels, what be connected with display panels covers brilliant film, and with the circuit board covering brilliant film and be connected, describedly cover brilliant film, circuit board, and display panels is equipped with polytype terminal, cover the terminal that terminal one end of brilliant film is corresponding with on circuit board, the terminal that the other end is corresponding with on display panels connects, distance s between terminals of adjacent is identical, the terminal of described every type comprises one, two, three, or more terminal, wherein a kind of terminal is high voltage terminal, the transverse width D of this high voltage terminal is greater than the transverse width d of other terminals, and the transverse width d of other terminals is all identical, the transverse width sum that the transverse width D of described high voltage terminal equals other n (n >=2) individual terminals of adjacent adds the spacing sum between this several terminal, that is: D=nd+ (n-1) s.
Wherein, display panels opens the TFT switch in panel simultaneously when shutting down.
Wherein, n equals 3.
Wherein, other terminals comprise: DUMMY terminal, NC terminal, VCOM terminal, VCOMTFT terminal, VGL terminal.
Wherein, described in cover brilliant film and comprise grid and cover brilliant film and source electrode covers brilliant film, terminal one end and the grid of display panels cover that brilliant film is connected, the other end covers brilliant film with source electrode and is connected.
Wherein, high voltage terminal covers on brilliant film at source electrode.
Wherein, high voltage terminal covers on brilliant film at grid.
Wherein, high voltage terminal covers brilliant film and grid covers on brilliant film at source electrode.
The present invention is applied to the circuit board terminals of TFT-LCD and covers brilliant film junction and cover brilliant film and display panels junction, the excessive reliability problem caused of reply surge current; By reducing contact impedance and being beneficial to heat radiation, the terminal large by surge current is merged into entirety, does not change the distribution of other electric signal terminal.
The present invention reduces the mode of junction impedance by adopting, not reducing high voltage shutdown electric current, when not changing the wiring of other positions, reducing the heat that electric current produces, and heat is discharged as early as possible, thus reduce the probability covering the damage of brilliant film.
Accompanying drawing explanation
Figure 1 shows that the schematic diagram of existing power off afterimage phenomenon;
The circuit diagram all opened of TFT when Figure 2 shows that existing shutdown;
Figure 3 shows that the oscillogram of voltage when existing normal display and shutdown;
VGH electric current and contrast test figure when normally showing when Figure 4 shows that existing shutdown;
Figure 5 shows that the cabling schematic diagram of existing panel;
Figure 6 shows that the schematic diagram that existing panel inner terminal connects;
Figure 7 shows that the structural representation of high voltage terminal of the present invention;
Figure 8 shows that the schematic diagram that panel inner terminal of the present invention connects;
Figure 9 shows that the terminal distribution schematic diagram of available circuit edge connector;
Figure 10 shows that the terminal distribution schematic diagram of circuit board golden finger of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Figure 7 shows that the structural representation of the high voltage VGH terminal of display panels of the present invention, for reducing crimping impedance, take the method for enlarged contact areas, that is designed by high voltage VGH terminal 60 is different from the terminal of other signal, the high voltage VGH terminal corresponding for high voltage VGH signal no longer adopts identical with other terminal, but corresponding high voltage VGH terminal is all linked together, there is not gap in centre, the transverse width of high voltage VGH terminal equals other terminal combination of the same race transverse width together, thus when not changing other terminal, enlarge active surface, reduce contact impedance, simultaneously due to the increase of contact area, the speed of heat loss is accelerated, also the probability making COF damage reduces.
As shown in Figure 8, liquid crystal indicator of the present invention is when shutdown, for eliminating power off afterimage phenomenon, need all to be opened by all TFT with high voltage VGH, to make the electric charge in pixel capacitance release as early as possible, now required VGH electric current is larger, larger heat is produced in the path that it flows through, especially covering brilliant film and circuit board and display panels junction resistance comparatively greatly, easier accumulation heat, causes damage.
Liquid crystal indicator comprise display panels 2, be connected with display panels 2 cover brilliant film 1 and with the circuit board 3 covering brilliant film 1 and be connected, only change cover brilliant film 1 pin position, the pin position of circuit board golden finger 3, the pin position high voltage VGH terminal 60 everywhere of display panels 2, the terminal data at other pin position places all do not change with arrangement, pass through enlarged contact areas, reducing contact impedance, reducing covering the probability that brilliant film burns.
Be illustrated in figure 9 the terminal distribution schematic diagram of available circuit edge connector place 1-114 pin position, wherein DUMMY, NC represent empty connecting terminal, VCOM, VCOMTFT, VGH, VGL are power supply signal terminal, DUMMY terminal, NC terminal, VCOM terminal, VCOMTFT terminal, VGL terminal, often kind of terminal comprise one, two, three, or more a terminal, these signal terminals, produce from circuit board, by covering brilliant film transfer to source driving chip, grid drive chip and display panels.When circuit board crimps by covering brilliant film with display panels, in order to all kinds of electric signal can be correct access source driving chip and grid drive chip, required voltage signal adds liquid crystal panel inside the most at last, cover brilliant film, the terminal assignment of circuit board golden finger and display panels is all identical.The width of existing every butt is with indirectly all identical, in the present embodiment, the transverse width d of every butt is 8mil (1mil=0.0254mm), the spacing at two terminal centers is 14mil, namely the distance s between terminals of adjacent is 6mil, and all 114 termination width are identical with gap design.
Figure 10 is the pin position distribution schematic diagram of the circuit board golden finger of the application, by by original 22, 23, the high voltage VGH terminal 60 of No. 24 is by original released state, be merged into same terminal supportor, the necessary electric signal of the terminal merged is identical, and each other without other electric signal terminal, like this, originally the width of three terminals is 8*3=24mil, and be merged into a place, the transverse width d sum that the transverse width D of new high voltage terminal equals other three terminals of adjacent adds the distance s sum between these 3 terminals, that is: D=3d+2s, 3*8+2*6=36mil, like this when not changing the distribution of other pin pin, contact area is become large, crimping impedance reduces, simultaneously, because the change of contact area is large, heat dispersal situations also can be relative improvement.
The high voltage terminal of above-described embodiment is that 3 terminals merge, and in other embodiments, also may be 2 or 4 an or more terminal.
Above-mentionedly cover brilliant film finally for source electrode covers brilliant film, other conditions also can be that grid covers brilliant film or source electrode and covers brilliant film and source electrode and cover on brilliant film and all design this high voltage terminal certainly.
Claims (8)
1. a liquid crystal indicator, it comprises display panels, what be connected with display panels covers brilliant film, and with the circuit board covering brilliant film and be connected, it is characterized in that: described in cover brilliant film, circuit board, and display panels is equipped with polytype terminal, cover the terminal that terminal one end of brilliant film is corresponding with on circuit board, the terminal that the other end is corresponding with on display panels connects, distance s between terminals of adjacent is identical, the terminal of described every type comprises one, two, three, or more terminal, wherein a kind of terminal is high voltage terminal, the transverse width D of this high voltage terminal is greater than the transverse width d of other terminals, and the transverse width d of other terminals is all identical, the transverse width sum that the transverse width D of described high voltage terminal equals other n (n >=2) individual terminals of adjacent adds the spacing sum between this several terminal, that is: D=nd+ (n-1) s.
2. liquid crystal indicator according to claim 1, is characterized in that: display panels opens the TFT switch in panel simultaneously when shutting down.
3. liquid crystal indicator according to claim 1, is characterized in that: n equals 3.
4. liquid crystal indicator according to claim 1, is characterized in that: other terminals comprise: DUMMY terminal, NC terminal, VCOM terminal, VCOMTFT terminal, VGL terminal.
5. liquid crystal indicator according to claim 1, is characterized in that: described in cover brilliant film and comprise grid and cover brilliant film and source electrode covers brilliant film, terminal one end and the grid of display panels cover that brilliant film is connected, the other end covers brilliant film with source electrode and is connected.
6. liquid crystal indicator according to claim 5, is characterized in that: high voltage terminal covers on brilliant film at source electrode.
7. liquid crystal indicator according to claim 5, is characterized in that: high voltage terminal covers on brilliant film at grid.
8. liquid crystal indicator according to claim 5, is characterized in that: high voltage terminal covers brilliant film and grid covers on brilliant film at source electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510133837.8A CN104678621B (en) | 2015-03-25 | 2015-03-25 | Liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510133837.8A CN104678621B (en) | 2015-03-25 | 2015-03-25 | Liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104678621A true CN104678621A (en) | 2015-06-03 |
| CN104678621B CN104678621B (en) | 2017-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510133837.8A Active CN104678621B (en) | 2015-03-25 | 2015-03-25 | Liquid crystal display device |
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| CN (1) | CN104678621B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106875881A (en) * | 2015-12-10 | 2017-06-20 | 奇景光电股份有限公司 | Display device |
| US10818239B2 (en) | 2018-09-10 | 2020-10-27 | Boe Technology Group Co., Ltd. | Pixel driving circuit and method for driving the same, pixel unit and display panel |
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| US20050219432A1 (en) * | 2004-04-06 | 2005-10-06 | Lg Philips Lcd Co., Ltd. | Liquid crystal display device |
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| CN102271457A (en) * | 2011-07-19 | 2011-12-07 | 南京中电熊猫液晶显示科技有限公司 | Display device |
| CN103746197A (en) * | 2013-12-31 | 2014-04-23 | 上海友邦电气(集团)股份有限公司 | Test type high-voltage terminal |
| CN104200767A (en) * | 2014-09-18 | 2014-12-10 | 南京中电熊猫液晶显示科技有限公司 | Array substrate, display device and detection method of display device |
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2015
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| KR20050073820A (en) * | 2004-01-12 | 2005-07-18 | 엘지이노텍 주식회사 | Cold cathode ray tube installation structure of inverter module for lcd |
| US20050219432A1 (en) * | 2004-04-06 | 2005-10-06 | Lg Philips Lcd Co., Ltd. | Liquid crystal display device |
| CN1707334A (en) * | 2004-06-07 | 2005-12-14 | 株式会社日立显示器 | Liquid crystal display device |
| JP2008251817A (en) * | 2007-03-30 | 2008-10-16 | Seiko Epson Corp | Semiconductor device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106875881A (en) * | 2015-12-10 | 2017-06-20 | 奇景光电股份有限公司 | Display device |
| CN106875881B (en) * | 2015-12-10 | 2020-02-07 | 奇景光电股份有限公司 | Display device |
| US10818239B2 (en) | 2018-09-10 | 2020-10-27 | Boe Technology Group Co., Ltd. | Pixel driving circuit and method for driving the same, pixel unit and display panel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104678621B (en) | 2017-09-19 |
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