US20230408879A1 - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- US20230408879A1 US20230408879A1 US18/459,489 US202318459489A US2023408879A1 US 20230408879 A1 US20230408879 A1 US 20230408879A1 US 202318459489 A US202318459489 A US 202318459489A US 2023408879 A1 US2023408879 A1 US 2023408879A1
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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
- G02F1/133—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
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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
- G02F1/133—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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- 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
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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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
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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
- G02F1/133—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
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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
- G02F1/133—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
- G02F1/136254—Checking; Testing
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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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/56—Substrates having a particular shape, e.g. non-rectangular
Abstract
The purpose of the present invention is to realize a structure that the testing terminals are remained in the final product in the liquid crystal display device having a variant display area. The structure of the present invention is as follows. The display area is variant, the outer shapes of the counter substrate 200 and the TFT substrate are also variant similar to the display area. The terminal area formed on the TFT substrate has a straight first area, a second area and a third area; the second area and the third are bent from the first area and formed at sides of the first area. A plurality of terminals to drive the liquid crystal display device exist in the first area, and a plurality of terminals for testing the liquid crystal display device exist in the second area and the third area.
Description
- This application is a continuation of U.S. patent application Ser. No. 17/844,104, filed on Jun. 20, 2022. Further, this application claims priority from Japanese Patent Application JP 2021-103006 filed on Jun. 22, 2021, the contents of which are hereby incorporated by reference into this application.
- The present invention relates to a display device, specifically to a liquid crystal display device having variant display area.
- A liquid crystal display device has a structure including the TFT substrate, in which the pixels having the pixel electrodes and the TFTs (Thin Film Transistor) are arranged in matrix, the counter substrate opposing to the TFT substrate, and a liquid crystal layer sandwiched between the TFT substrate and the counter substrate. A light transmittance of each of the pixels is controlled by liquid crystal molecules in each of the pixels; thus, images are formed.
- Liquid crystal display devices are now being used in various area since liquid crystal display devices can be made small and light. The liquid crystal display device has a rectangular display area in general; however, in recent years, a demand for the liquid crystal display device having a display area of not rectangular shape (it may be called as variant display area in this specification) is increasing. Those usages are, for example, in-vehicle display devices, VR (Virtual Reality) display devices, display devices for watches, and so forth.
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Patent document 1 discloses driving method and layout which are suitable for the display area of not rectangular. On the other hand, especially in a small display device, it is also necessary to make a terminal area smaller. Patent document 2 discloses a structure of terminal area for grounding the outer surface of the counter substrate in the IPS mode liquid crystal display device. -
- Patent document 1: Japanese patent application laid open No. 2017-083759
- Patent document 2: Japanese patent application laid open No. 2017-146450
- Display devices for a VR, a watch and so forth have approximately circular display areas. It is preferable for such devices to have a circular outer shape. A terminal area also becomes smaller in such a small liquid crystal display device. Terminal wirings, terminals for video signals, a driver IC, testing wirings, an earth electrode to give ground potential to the outer surface of the counter substrate are located in the terminal area.
- If the outer shape of the liquid crystal display device is rectangular, it is rather easy to locate those elements in the terminal area; however, if the outer shape becomes circular or variant shape of e.g. polygon, it becomes difficult to provide a space in the display area to locate those elements. Since testing terminals and testing wirings are used mainly in the manufacturing process, a part of the terminal area for those elements can be cut away; however, in such a counter measure, there arises a problem of cost for cutting off those areas and also a problem that quality check cannot be performed after the product is completed.
- A purpose of the present invention is to overcome the above explained problems and to realize a structure that the testing terminals and the testing wirings are remained in the terminal area; in addition, terminals for signals, terminals for power and so forth are also remained in the terminal area of the display device having variant display area or variant outer shape.
- The present invention solves the above explained problems; the representative structures are as follows.
- (1) A liquid crystal display device including a TFT substrate and a counter substrate, a display area formed in an area in which the TFT substrate and the counter substrate overlap each other, and a terminal area formed on the TFT substrate on which the counter substrate is not overlapped; in which the display area is variant, an edge of the terminal area has a
first edge 610 apart from the counter substrate in a first direction and extending in a second direction in straight, asecond edge 620 is located in a first side from thefirst edge 610, and having afirst angle 650 with respect to the second direction, athird edge 630 is located in a second side from thefirst edge 610, and having asecond angle 660 with respect to the second direction, a first area is defined as an area between thefirst edge 610 and afourth edge 710 of the counter substrate, a second area is defined as an area between thesecond edge 620 and afifth edge 720 of the counter substrate, a third area is defined as an area between thethird edge 630 and asixth edge 730 of the counter substrate, a plurality of first terminals align in the second direction along the first edge in the first area, a plurality of second terminals exist in the second area, a plurality of third terminals exist in the third area, the plurality of the first terminals are to drive the liquid crystal display device, and the plurality of the second terminals and the plurality of the third terminals are to test the display area of the liquid crystal display device with a test image. The above numerical numbers correspond to the numerical numbers inFIG. 3 . The first direction corresponds to y direction inFIG. 3 and the second direction corresponds to x direction inFIG. 3 . - (2) The liquid crystal display device according to (1), in which an outer shape of the counter substrate is variant similar to the display area.
- (3) The liquid crystal display device according to (1), in which an outer shape of the TFT substrate is variant similar to the display area.
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FIG. 1 is a comparative example of a liquid crystal display device having a variant display area; -
FIG. 2 is another comparative example of a liquid crystal display device having a variant display area; -
FIG. 3 is an example of the liquid crystal display device according toembodiment 1; -
FIG. 4 is an example of a testing circuit according toembodiment 1; -
FIG. 5 is another example of the testing circuit according toembodiment 1; -
FIG. 6 is an example of a scanning line driving circuit; -
FIG. 7 is a concrete example of the scanning line driving circuit; -
FIG. 8 is an example of a cross sectional view of the structure of the earth electrode and its vicinity; -
FIG. 9 is an example of a plan view of the structure of the earth electrode and its vicinity; -
FIG. 10 is a plan view of an example of embodiment 2; -
FIG. 11 is a circuit diagram according to embodiment 3; -
FIG. 12 is a plan view which shows an example of a liquid crystal display device according to embodiment 4; and -
FIG. 13 is a plan view which shows another example of a liquid crystal display device according to embodiment 4. - The present invention is explained concretely in the following embodiment. A term of variant shape may be used for a shape of not rectangular. The structure of four sides with large corner R as exemplified in embodiment 4 also may be called as a variant shape.
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FIG. 1 is a liquid crystal display device which has adisplay area 10 of octagon, which is close to a circle. Such a liquid crystal display device is used for a watch, a VR display device and so forth. InFIG. 1 , thedisplay area 10 is formed at an area in which aTFT substrate 100 of hexagon and acounter substrate 200 of hexagon overlap each other.Scanning lines 11 extend in the lateral direction (the x direction) and are arranged in the vertical direction (the y direction);video signal lines 12 extend in the vertical direction and are arranged in the lateral direction. Apixel 13 is formed in an area surrounded by thescanning lines 11 and thevideo signal lines 12. - A terminal area is formed in an area in which the
TFT substrate 100 does not overlap thecounter substrate 200. In the terminal area, in addition to terminal wirings, adriver IC 40,connection terminals 25 for a flexible wiring substrate, which is not shown, are located. Further,testing terminals 35, testing wirings, an earth electrode, and aconductive member 170 formed on the earth electrode to connect the transparent conductive film on the surface of thecounter substrate 200 to ground are located in the terminal area. Thetesting terminals 35 and the testing wirings are large in numbers because they display images in the display area to find whether defects exist or not before the driver IC 40 is installed. The situation is the same even when the driver IC 40 is installed on the flexible wiring substrate. The reason is that the testing terminals are used for testing display images before the driver IC 40 is connected to the connectingterminals 25 through the flexible wiring substrate even when the driver IC 40 is installed on the flexible wiring substrate. - As described above, various elements are located in the terminal area, thus the terminal area is made rectangular to secure a space for those elements. However, if the terminal area is made rectangular, even when the shape of the display area is octagon, the outer shape of the display device becomes hexagon, which is very different from the shape of the
display area 10. The display device of such outer shape is not easy to be installed in the product; in addition, it is not easy to make the frame area narrow in a product of watch, and so forth, further it is not preferable in terms of design. - By the way, since the
testing terminals 35 inFIG. 1 are to test whether defects exist or not on the display panel before thedriver IC 40 is installed, they are not indispensable after thedriver IC 40 is installed. Thus, the structure exemplified byFIG. 2 is conceivable. That is to say, thetesting terminals 35 are located below theconnection terminals 25 in the y direction; thetesting terminals 35 are cut away as depicted bybroken line 500 inFIG. 2 after the liquid crystal display device is completed. - This method, however, needs an additional process of cutting away a part of the terminal area. In addition, there could arise a necessity to retest the
display area 10 for some reason even after thedriver IC 40 is installed; however, it is impossible after thetesting terminals 35 are cut away. -
FIG. 3 is a plan view ofembodiment 1 of the present invention, which overcomes the above explained problem. InFIG. 3 , thecounter substrate 200 and theTFT substrate 100 are octagon corresponding to thedisplay area 10. Therefore, the structure ofFIG. 3 provides a narrow frame region and makes it easy for a liquid crystal display panel to be installed in the product. - In
FIG. 3 , the terminal area is not rectangular, but is bent at both sides with a certain angle with respect to the y direction or the x direction. In other words, the terminal area is formed along three sides of thecounter substrate 200 or theTFT substrate 100. - In
FIG. 3 , a plurality of connectingterminals 25, through which signals or powers are input to drive the liquid crystal display device, thedriver IC 40,testing terminals 35 and the conductingmember 170, which is to ground the shield electrode formed on the outer surface of thecounter substrate 200, are located. The connectingterminals 25 are arranged in line on a first line in the x direction near the edge of theTFT substrate 100. Thedriver IC 40 is set above the connectingterminals 25 in the y direction in parallel with the aligned direction of the connectingelectrodes 25. - In
FIG. 3 , thetesting terminals 35 and theconductive member 170 are located in a bent area from the first line.Many testing terminals 35 exist; at least a part of them are formed above the upper long side of the drivingIC 40 in the y direction. In other words, thedriver IC 40 is rectangular in a plan view having a long side in the x direction and a short side in the y direction; at least a part of thetesting terminals 35 exist above, in the y direction, the upper long side of the drivingIC 40. The plurality of thetesting terminals 35 are located above, in the y direction, the first line in which the plurality of connectingterminals 25 are aligned. - In
FIG. 3 , theconducive member 170 for grounding is formed near an edge of thecounter substrate 200 orTFT substrate 100 in the x direction in the bent terminal area in a plan view, however, the position for theconductive member 170 is not limited to the above position. As will be explained later, a liberty for location of the conductive member can be secured by e.g. adopting a two level crossing with the testing wirings using the same insulating film formed by the simultaneous manufacturing process as in thedisplay area 10. -
FIG. 4 is a circuit diagram to explain functions of thevideo signal lines 12, thedriver IC 40, the terminal wirings 20, connectingterminals 25, thetesting terminals 35 and so forth corresponding toFIG. 3 . Thevideo signal lines 12 extend in the y direction and are arranged in the x direction. Thevideo signal lines 12 extending from thedisplay area 10 are connected to thedriver IC 40. In the meantime, in an actual device, a pitch of thevideo signal line 12 in thedriver IC 40 is smaller than a pitch of thevideo signal lines 12 in thedisplay area 10, therefore, inclined wirings are formed in the middle, however, sinceFIG. 4 is a model diagram, thevideo signal lines 12 are depicted as straight lines. - The connecting
terminals 25 are formed below thedriver IC 40 in the y direction. Video signals, scanning signals, clock signals, powers and the like are supplied from the connectingterminals 25. Even though the video signals are supplied from the connecting terminals, data for one scanning line are formed by parallel serial conversion in the driving circuit in thedriver IC 40; thus the number of the connectingterminals 25 is much smaller than the number of the video signal lines 12. If the terminals connected to the connectingterminals 25 are called input terminals, and the terminals connected to thevideo signal lines 12 are called output terminals in thedriver IC 40, the number of the output terminals is much larger than the number of the input terminals. - In
FIG. 4 , the testing wirings 30 branch off from thevideo signal lines 12 through selecting switches 50. The testing wirings 30 are connected to thetesting terminals 35 located in left side. Thetesting terminals 35 exist in the bending portion of the terminal area depicted inFIG. 3 . The selecting switches 50 can be formed by TFT (Thin Film Transistor). The number of the selecting switches 50 is the same as the number of video signal lines 12. - The purpose of the inspection is to check whether defects exist in the liquid crystal display panel or not by forming a display image in the
display area 10 before thedriver IC 40 is connected. This means the same number of thetesting terminals 35 is necessary as the number of thevideo signal lines 12, however, it is impossible to locate such large number oftesting terminals 35 in the terminal area. On the other hand, only testing images are necessary to display in the test; thus the number of thetesting wirings 30 and thetesting terminals 35 are decreased by supplying the same signals to several video signal lines 12. InFIG. 4 , thetesting wirings 30 extend not only in the direction to the testing terminals 35 (left hand side in the x direction) but also extend to the right hand side in the x direction to be connected withvideo signal lines 12 in the right hand side. If the number of thevideo signal lines 12 in which the same signal is input is n, the number of thetesting terminals 35 becomes 1/n of the number of the video signal lines 12. - In
FIG. 4 , in a plan view, there are many terminals under thedriver IC 40 to be connected to the video signal lines 12. Therefore, sizes and pitches of the output terminals of theIC deriver 40 are very small. On the other hand, thetesting terminals 35 need to contact the testing probes, therefore, certain sizes and pitches are necessary for thetesting terminals 35. Consequently, an area for thetesting terminals 35 tend to be large. In the present invention, as depicted inFIG. 4 , thetesting terminals 35 are not aligned with thedriver IC 40 or connectingterminal 25, but they are located at upper position in the y direction inFIG. 4 , or in referring toFIG. 3 , they are located at the bending portion of the terminal area; thus necessary space can be secured for thetesting terminals 35. -
FIG. 5 is a plan view in which thetesting wirings 30, thetesting terminals 35, thevideo signal lines 12, terminal wirings 20, connectingterminals 25, and so forth ofFIG. 4 are located in actual layout in similar to the liquid crystal display device ofFIG. 3 . InFIG. 5 , the outer shape of thecounter substrate 200 is polygon approximately similar to thedisplay area 10; the outer shape of theTFT substrate 100 is also approximately similar polygon. TheTFT substrate 100 and thecounter substrate 200 are adhered by theseal material 150 formed at an edge of thecounter substrate 200 with certain width. TheTFT substrate 100 on which thecounter substrate 200 does not overlap is a terminal area; the terminal area has bending portions, which has certain angles with the x direction and the y direction at both sides. - The
video signal lines 12 extend to bottom in the y direction from thedisplay area 10. Since the width of thedisplay area 10 in the x direction is larger than the width of thedriver IC 40 in the x direction, thevideo signal lines 12 bend in the middle, and are connected to thedriver IC 40 through inclined wring portions. The bending portions of the video signal lines 120 are located in the area on which theseal material 150 is formed. - In
FIG. 5 , thetesting wirings 30, which are branched off from thevideo signal lines 12 through the selecting switches 50, extend as crossing the video signal lines 12. The testing wirings 30 extend in left hand side to be connected with thetesting terminals 35 formed in the bending portion of the terminal area. The testing wirings 30 extend also to right hand side in the x direction, and are connected with other plurality ofvideo signal lines 12 through selectingswitches 50 to decrease the number of thetesting terminals 35 and thetesting wirings 30. - In
FIG. 5 , the selectingswitches 50 can be formed by TFT, therefore, necessary space is small. In addition, only one gate wiring is necessary for the TFTs as the selecting switches. As shown inFIG. 5 , thetesting terminals 35 are located in the bending portion of the terminal area. Therefore, those testingterminals 35 can be remained in the final products. In addition, the outer shape of the liquid crystal display panel, which is the same as the outer shape of theTFT substrate 100, can be approximately similar to thedisplay area 10; therefore, installing of the liquid crystal panel into the final product is easy. -
Many scanning lines 11 extend in the lateral direction and are arranged in longitudinal direction in thedisplay area 10. However, scanning signals supplied to thescanning lines 11 are generated in the shift resister, thus, many terminals as for thevideo signal lines 12 are not necessary.FIG. 6 is a plan view which shows a model of relation between thedisplay area 10 at the bending portion and the shift resister. - R, G and B in
FIG. 6 mean Red pixel, Green pixel and Blue pixel, respectively. InFIG. 6 , the scanning line is provided in every line, scanning signals are supplied fromunit circuits 60 which constitute the shift resister. InFIG. 6 , VOUT1 means a scanning signal supplied form theunit circuit 60; VOUT2 is a signal to start theunit circuit 60 of the following step. -
FIG. 7 is a circuit diagram of shift resistor ofFIG. 6 .FIG. 7 is an example of scanning line driving circuit which has 4 phase clocks. InFIG. 7 , the scanning line signal is generated from upper side to lower side in order. InFIG. 7 , theunit circuit 60 in the first step is VSRIN, andunit circuit 60 VSR1 is repeated in the second step and below. InFIG. 7 , RES signal is supplied to GIN-1 terminal as a start pulse. InFIG. 7 , VOUT2 of previous step is supplied to GIN-1 terminal of second step and below. Clock pulses of different phase are supplied to VCK1, VCK2, VCK3, and VCK4 terminals. VDD and VSS are terminals for powers. - As described above, since the scanning line driving circuit does not need many terminals, it is possible to use the terminals for the final product as testing terminals. By the way, the terminals in the final product, including the terminals for the scanning line driving circuit, except the testing terminals, are connected with the flexible wiring substrate. Therefore, there is a chance that a terminal pitch for the scanning line driving circuit becomes very small to adapt to the terminal pitch of flexible wiring substrate, consequently, touching by testing probes becomes difficult. In that case, it is possible to branch off the testing wirings 30 from each of the wirings which are connected to the
unit circuit 60, and provide thetesting terminals 35. - In this case, if the shape of the liquid crystal display panel is like
FIG. 3 , thetesting terminals 35 for driving the shift resister can be located in the bending portion of the terminal area ofFIG. 3 . - Generally, a liquid crystal display device has a problem in viewing angle characteristics, however, the IPS (In Plane Switching) mode liquid crystal display device has improved viewing angle characteristics. In the IPS mode, a comb shaped pixel electrode and a plane shaped common electrode are formed on the
TFT substrate 100, namely, the common electrode does not exist on thecounter substrate 200. As a result, noise penetrates the inside of the liquid crystal display panel from the side ofcounter substrate 200, consequently, quality of images is deteriorated. In order to counter measure this problem, a transparent conducive film (it may be called as ashield electrode 210, herein after) formed from e.g. ITO (Indium Tin Oxide) is formed on the outside of thecounter substrate 200, and a ground potential is applied to the transparentconductive film 210 to shield inside of the liquid crystal display panel. - In order to apply a ground potential to the outside of the
counter substrate 200, anearth electrode 80 is formed on the terminal area of theTFT substrate 100, and theearth electrode 80 and theshield electrode 210 formed on thecounter substrate 200 are connected through theconductive member 170. For example, silver paste or conductive tape are used for theconductive member 170. InFIG. 3 and the like, only theconductive member 170 is depicted. Actually, however, theearth electrode 80 exists under theconductive member 170. -
FIG. 8 is a cross sectional view along the line A-A inFIG. 3 , namely, a cross sectional view of the portion at theearth electrode 80. InFIG. 8 , theTFT substrate 100 and thecounter substrate 200 adhere to each other through theseal material 150; theliquid crystal 300 is sandwiched between theTFT substrate 100 and thecounter substrate 200. - Actually, many layers are formed on the
TFT substrate 100 and thecounter substrate 200; however, those layer are omitted inFIG. 8 . Onlyorganic passivation film 110 is depicted on the side of theTFT substrate 100. On theTFT substrate 100, theorganic passivation film 110 is formed thick as 2 to 4 microns because theorganic passivation film 110 is used as a flattening film. The transparentconductive film 210 for shield is formed on the outside of thecounter substrate 200. - The feature of
FIG. 8 is that theorganic passivation film 110 extends to outside of theseal material 150, and theearth electrode 80 is formed on theorganic passivation film 110. The metal oxide conductive film as ITO and the like, which are chemically stable, is used for theearth electrode 80. The transparentconductive film 210 formed on the outside of thecounter substrate 200 and theearth electrode 80 are electrically connected to each other byconductive member 170. - In
FIG. 8 , theearth electrode 80 is connected with theearth wiring 85 formed on theTFT substrate 100 via the throughhole 81 formed in theorganic passivation film 110. In the meantime, theorganic passivation film 110, on which theearth electrode 80 is formed, is continuously formed from theorganic passivation film 110 in thedisplay area 10 inFIG. 8 , however, theorganic passivation film 110 can be separated between inside of theseal material 150 and outside of the seal material. - In
FIG. 8 , since theearth electrode 80 is formed on theorganic passivation film 110, necessary wirings can be formed under theearth electrode 80.FIG. 9 is an example in which testing wirings 30 pass under theorganic passivation film 110. InFIG. 9 , a plurality of thetesting wirings 30 extend in a direction crossing the extending direction of theearth wiring 85 under theorganic passivation film 110, namely, under theearth electrode 80. - The
earth electrode 80 and theconductive member 170 are located in the corner of the terminal area inFIG. 3 , however, if the structure ofFIG. 9 is adopted, theearth electrode 80 and theconductive member 170 can be located in any position.FIG. 10 is one example of that.FIG. 10 is the same asFIG. 3 except the position of theearth electrode 80 and theconductive member 170. InFIG. 10 , theearth electrode 80 is located inner side in the x direction in the bending portion of the terminal area. Theearth electrode 80 and theconductive member 170 are located between thetesting terminals 35 in a plan view. - When the
earth electrode 80 is laid out in such position, there arises a problem of routing of thetesting wirings 30; however, the structure ofFIG. 9 can avoid theearth electrode 80 from being an obstruction to a layout of thetesting wirings 30. As described above, theearth electrode 80 can be located in any place in the terminal area according to a need of layout by adopting the structure ofFIG. 9 . In addition, the straight line, along which theconnection electrode 25 and the drivingIC 40 are located, can be made shorter by locating theearth electrode 80 in the bending portion of the terminal area; consequently, the outer shape of theTFT substrate 100 can be further made similar to the shape of thedisplay area 10. -
FIG. 11 is a plan view of embodiment 3.FIG. 11 differs fromFIG. 5 ofembodiment 1 in that thediver IC 40 does not exist in the terminal area. In this case, thedrier IC 40 is installed on the flexible wiring substrate. Even in such a case, too, a check is necessary whether defects exist in the display panel or not before the flexible wiring substrate is connected. - The structure of
FIG. 11 is adopted when a width wt of the terminal area in the y direction is made smaller. The width wt of the terminal area in the y direction is made smaller by eliminating thedriver IC 40 from the terminal area; however, the number of the connectingterminals 25 increases greatly compared with the structure ofFIG. 5 . Principally, the connectingterminals 25 are necessary as the same number of the video signal lines 12. Therefore, a width of the total connectingterminals 25 aligned in the x direction becomes large. In addition, since the connectingterminals 25 are very small, the testing probe cannot be adapted. - In
FIG. 11 , the terminal area is bent, and thetesting terminals 35 are located in the bending portion, therefore, increased connectingterminals 25 can be overcome. InFIG. 11 , thetesting wirings 30 branching off from thevideo signal lines 12 through the selectingswitches 50 to be connected to thetesting terminals 35 is the same as explained inFIGS. 4 and 5 . In the terminal area, thevideo signal lines 12 are directly connected with the connectingterminals 25. Other structures are the same as explained inFIGS. 4 and 5 . - The scanning lines 11, the scanning
line driving circuit 60,earth electrode 80 and the like are also the same as explained inembodiment 1 and embodiment 2. Since a width of the terminal area is small in embodiment 3, theearth electrode 80 of embodiment 2 has a large merit because testing wirings 30 can pass under theearth electrode 80. -
FIG. 12 shows an example when thedisplay area 10 is circle. Thedisplay area 10 is formed in the area in which theTFT substrate 100 and thecounter substrate 200 overlap. The outer shape of thecounter substrate 200 is a circle larger than the circle of thedisplay area 10. TheTFT substrate 100 and thecounter substrate 200 adhere to each other by the ring shapedseal material 150, and the liquid crystal is sealed thereinside. TheTFT substrate 100 is oval, elongated in the y direction, since the terminal area cannot be formed if theTFT substrate 100 and thecounter substrate 200 are the same size. In other words,TFT substrate 100 is race track shaped in which a length in the y direction is a little bit longer than a length in the x direction. - The connecting
terminals 25 align in line in the x direction. A width of alignedterminals 25 is xl in total. TheTFT substrate 100 has a straight line of length xl in parallel with the connectingterminals 25. If the length of xl is large, the outer shape of theTFT substrate 100 deviates from the circle, thus, xl should be limited so that a deviation from the circle is not conspicuous. InFIG. 12 , thedriver IC 40 is located between thedisplay area 10 and the connectingterminal array 25. - In
FIG. 12 , thetesting terminals 35 are located above thedriver IC 40 in the y direction, and outside thedriver IC 40 in the x direction. The relations among thevideo signal lines 12, thetesting wirings 30, thetesting terminals 35, thedriver IC 40, the terminal wirings 20, the connectingterminals 25 and the like are the same as explained inFIG. 4 ofembodiment 1. The scanning wiring line driving circuit side is also the same as explained inFIGS. 6 and 7 . The location of theearth electrode 80 and theconductive member 170 is the same as explained in embodiment 2. Further, the structure in a case when thedriver IC 40 is installed on the flexible wiring substrate is the same as explained in embodiment 3. - In
FIG. 12 , the shapes of thedisplay area 10 and thecounter substrate 200 are circles, however, they need not limited to circle. - They can be elliptical, or a part of the
display area 10 can be parabola, hyperbola, or elliptical. In addition, thedisplay area 10, thecounter electrode 200, theTFT substrate 100 and the like can be a race track shape, which is a combination of a straight line and a circle. The features in those cases are the same as explained inFIG. 12 . That is to say, the connectingterminals 25 align in line in the x direction in the terminal area of theTFT substrate 100; the edge of the terminal area is straight line in length of xl in parallel with the connectingterminal array 25. The both sides outside of the strait line of the terminal area bend in a curve. -
FIG. 13 is an example that thedisplay area 10 resembles to rectangular as a whole, but corners have a large radius of curvature. Such shape is also called variant shape in the present specification. The outer shape of thecounter substrate 200 also is variant shape formed along thedisplay area 10 and having a large radius of curvature in the corners. InFIG. 13 , thecounter substrate 200 and theTFT substrate 100 adhere to each other by theseal material 150; thedisplay area 10 is formed in the area in which thecounter substrate 200 and theTFT substrate 100 overlap; the terminal area is formed in the area in whichTFT substrate 100 does not overlap thecounter substrate 200. - The lower edge of the terminal area in the y direction is constituted by a straight line and a first curved portion on the left and a second curved portion on the right. When the area between the straight line and the
counter substrate 200 is defined as a first area, a plurality of connectingterminals 25 are aligned in the x direction in a range of xl in the edge of the first area. In a plan view, thedriver IC 40 is located in a space between the plurality of connectingterminals 25 and thecounter substrate 200. In the meantime, thedriver IC 40 may not exist in the terminal area as explained in embodiment 3. - In
FIG. 13 , the area between the first curve and thecounter substrate 200 is defined as a second area; and the area between the second curve and thecounter substrate 200 is defined as a third area. Thetesting terminals 35 are located in the second area and the third area. Theearth electrode 80, which supplies a ground potential to the outer surface of thecounter substrate 200, is formed in the second area. - In
FIG. 13 , thetesting terminals 35 are located above the connectingterminals 25 in the y direction. Thetesting terminals 35 are located above the drivingIC 40 in the y direction. As shown inFIG. 13 ,many testing terminals 35 are located in the second area and the third area, thus, the product can be tested even after the product is completed according to necessity using thetesting terminals 35.
Claims (7)
1. A display device comprising a TFT substrate and a counter substrate,
a display area formed in an area in which the TFT substrate and the counter substrate overlap each other, and
a terminal area formed on the TFT substrate on which the counter substrate is not overlapped,
wherein the display area is variant,
an edge of the terminal area has a first edge of the TFT substrate apart from the counter substrate in a first direction and extending in a second direction in straight,
a second edge of the TFT substrate is located in a first side from the first edge, and having a first angle with respect to the second direction,
a third edge of the TFT substrate is located in a second side from the first edge, and having a second angle with respect to the second direction,
a first area of the TFT substrate is defined as an area between the first edge of the TFT substrate and a fourth edge of the counter substrate,
a second area of the TFT substrate is defined as an area between the second edge of the TFT substrate and a fifth edge of the counter substrate,
a third area of the TFT substrate is defined as an area between the third edge of the TFT substrate and a sixth edge of the counter substrate,
a plurality of connection terminals is provided in the first area and aligns in the second direction along the first edge,
a plurality of testing terminals is provided in the second area, and
the plurality of the connection terminals is connected to a flexible wiring substrate.
2. The display device of claim 1 , wherein
a testing wiring is pulled out from one of the plurality of test terminals, and
the testing wiring crosses the fifth edge of the counter substrate.
3. The display device of claim 2 , wherein
the fourth edge of the counter substrate is parallel to the first edge of the TFT substrate,
the fifth edge of the counter substrate is parallel to the second edge of the TFT substrate, and
the sixth edge of the counter substrate is parallel to the third edge of the TFT substrate.
4. The display device of claim 3 , wherein
an outer shape of the counter substrate is octagon,
an outer shape of the TFT substrate is octagon, and
a size of the counter substrate is smaller than a size of the TFT substrate.
5. The display device of claim 4 , wherein
the plurality of test terminals is to test the display area of the display device with a test image.
6. The display device of claim 4 , wherein
the TFT substrate includes a video signal line, and
the testing wiring crosses the video signal line outside of the display area.
7. The display device of claim 6 , wherein
the testing wiring is connected to the video signal line via a selecting switch.
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JP2021103006A JP2023002024A (en) | 2021-06-22 | 2021-06-22 | Liquid crystal display device |
US17/844,104 US11774822B2 (en) | 2021-06-22 | 2022-06-20 | Liquid crystal display device |
US18/459,489 US20230408879A1 (en) | 2021-06-22 | 2023-09-01 | Liquid crystal display device |
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US8004763B2 (en) * | 2005-03-04 | 2011-08-23 | Lg Chem, Ltd. | PDP filter and manufacturing method thereof |
US8334960B2 (en) * | 2006-01-18 | 2012-12-18 | Samsung Display Co., Ltd. | Liquid crystal display having gate driver with multiple regions |
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WO2019009184A1 (en) * | 2017-07-05 | 2019-01-10 | シャープ株式会社 | Active matrix substrate, display device and method for producing active matrix substrate |
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