WO2010089919A1 - 画像表示装置および短絡事故の修復方法 - Google Patents
画像表示装置および短絡事故の修復方法 Download PDFInfo
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- WO2010089919A1 WO2010089919A1 PCT/JP2009/066605 JP2009066605W WO2010089919A1 WO 2010089919 A1 WO2010089919 A1 WO 2010089919A1 JP 2009066605 W JP2009066605 W JP 2009066605W WO 2010089919 A1 WO2010089919 A1 WO 2010089919A1
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- signal line
- wiring pattern
- scanning line
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Definitions
- the present invention relates to an image display device and a method for repairing a short circuit accident, and can be applied to, for example, an active matrix image display device using an organic EL (Electro Luminescence) element.
- the present invention makes it possible to repair a short-circuited portion between wiring patterns by providing the scanning wiring with a bypass wiring pattern that bypasses a portion where the signal line and the scanning line intersect.
- An image display device using an organic EL element is an image display device that utilizes the light emission phenomenon of an organic thin film that emits light when an electric field is applied.
- the organic EL element can be driven with an applied voltage of 10 [V] or less. Therefore, this type of image display apparatus can reduce power consumption.
- the organic EL element is a self-luminous element. Therefore, this type of image display device does not require a backlight device and can be reduced in weight and thickness.
- the organic EL element is characterized by a fast response speed of about several microseconds. Therefore, this type of image display apparatus has a feature that an afterimage hardly occurs when a moving image is displayed.
- a display unit is formed by arranging pixel circuits including an organic EL element and a drive circuit for driving the organic EL element in a matrix.
- each pixel circuit is driven by a signal line driving circuit and a scanning line driving circuit arranged around the display unit through signal lines and scanning lines provided in the display unit, respectively, to obtain a desired one. Display an image.
- Patent Document 1 discloses a method of forming a pixel circuit using two transistors. According to this method, the configuration of the image display device can be simplified. Further, this Patent Document 1 discloses a configuration that prevents image quality deterioration due to variations in threshold voltage, mobility, and changes in characteristics of organic EL elements over time, for driving transistors that drive organic EL elements.
- this type of image display device may cause a short circuit between the wiring patterns provided in the display unit due to defects in the manufacturing process.
- This type of defect includes a defect in the photolithography process, a defect in the etching process, and adhesion of conductive foreign matter.
- the yield can be further improved.
- the present invention has been made in view of such problems, and an object thereof is to provide an image display device capable of repairing a short-circuit portion between wiring patterns and a method of repairing a short-circuit accident in the image display device. .
- An image display device displays a desired image on a display unit created by arranging pixel circuits in a matrix, and the scanning lines or signal lines of the display unit are signal lines or scanning lines.
- a wiring pattern is created in the same layer as the wiring pattern of the signal line or scanning line except for the part where the wiring pattern intersects, and a wiring pattern is created in a layer different from the wiring pattern of the signal line or scanning line at the intersecting part.
- the scanning line is provided with a bypass wiring pattern that crosses the wiring pattern of the signal line at an upper layer or a lower layer at a portion different from the intersecting portion and bypasses the intersecting portion.
- the method for repairing a short-circuit accident according to the present invention is applied to the image display device according to the present invention, and by cutting the scanning line, the intersecting portion is separated from the wiring pattern for bypass, and the signal line and the scanning Repair short circuit accidents between wires.
- a wiring pattern of the scanning line or signal line is created by wiring in the same layer as the wiring pattern of the signal line or scanning line, except for a part intersecting with the signal line or scanning line. If a wiring pattern of a scanning line or a signal line is created by wiring of a layer different from the wiring pattern, the signal line and the scanning line are arranged using the wiring on the same layer side with priority, and both the signal line and the scanning line are used. In addition, the signal lines or the scanning lines can be arranged by different layers only in a portion where the wiring of the same layer cannot be applied. Therefore, the impedance of the scanning line and the signal line can be reduced by applying a wiring pattern layer having a low sheet resistance on the same layer side.
- the signal line and the scanning line are formed in the same layer, and a short circuit accident is likely to occur between the signal line and the scanning line.
- a short circuit accident is likely to occur between the signal line and the scanning line.
- the signal line and the scanning line are laminated, it becomes difficult to remove only the portion where the signal line and the scanning line are short-circuited by trimming. The short circuit accident cannot be repaired.
- the scanning line is provided with a bypass wiring pattern that crosses the upper layer or the lower layer of the signal line at a portion different from the intersecting portion and bypasses the intersecting portion. Since the bypass wiring pattern bypasses the intersecting portion, when the intersecting portion is separated from the scanning line by trimming, the scanning line signal is transmitted instead of the scanning portion. As a result, a short-circuited portion between the scanning line and the signal line generated at the intersecting portion can be repaired.
- FIG. 1 is a plan view illustrating a layout of a pixel circuit applied to an image display device according to a first embodiment of the present invention. It is a block diagram showing the structure of an image display apparatus. It is a connection diagram showing the configuration of the pixel circuit in detail.
- FIG. 4 is a connection diagram illustrating the display unit of FIG. 2 in comparison with FIG. 3. 4 is a timing chart for explaining the operation of the pixel circuit of FIG. 3. It is also a connection diagram.
- FIG. 7 is a connection diagram for explanation following FIG. 6.
- FIG. 8 is a connection diagram for explanation following FIG. 7.
- FIG. 9 is a connection diagram for explanation following FIG. 8.
- FIG. 10 is a connection diagram for explanation following FIG. 9.
- FIG. 11 is a connection diagram for explanation following FIG. 10.
- FIG. 10 is a connection diagram for explanation following FIG. 9.
- FIG. 12 is a connection diagram for explanation following FIG. 11.
- FIG. 13 is a connection diagram for explanation following FIG. 12. It is a top view showing a short circuit location. It is a top view for explanation of restoration processing using a slit.
- FIG. 16 is a plan view for explaining a repair process using a slit according to an example different from FIG. 15. It is the connection diagram which showed the short circuit location equivalently. It is a top view for description of the short circuit location between a signal line and the scanning line for write signals. It is a top view for description of repair of the short circuit location of FIG.
- FIG. 20 is a plan view for explaining repair of a short-circuited portion according to an example different from FIG. 19. It is the connection diagram which showed the short circuit accident equivalently.
- FIG. 21 is a plan view for explaining repair of a short-circuited portion according to an example different from FIGS. 19 and 20.
- FIG. 24 is a plan view for explaining the repair of a short-circuited portion according to an example different from FIGS. 19, 20, and 23.
- FIG. 26 is a plan view for explaining repair processing in the pixel circuit of FIG. 25.
- FIG. 27 is a plan view for explaining repair processing in an example different from FIG. 26. It is a top view for explanation of contact failure.
- FIG. 2 is a block diagram showing the image display device of the present embodiment.
- the image display device 1 includes a display unit 2 on an insulating substrate such as glass, and includes a signal line driving circuit 3 and a scanning line driving circuit 4 around the display unit 2.
- the display unit 2 is formed by arranging pixel circuits (PXCL) 5 in a matrix.
- the signal line driving circuit 3 outputs a signal line driving signal Ssig to a signal line DTL provided in the display unit 2. Specifically, the signal line driving circuit 3 sequentially latches the image data D1 input in the raster scanning order by the horizontal selector (HSEL) 3A and distributes the image data D1 to the signal lines DTL, and then performs digital-analog conversion processing. To do.
- the signal line driving circuit 3 processes the digital / analog conversion result to generate a driving signal Ssig. Thereby, the image display apparatus 1 sets the gradation of each pixel circuit 5 by so-called line sequential, for example.
- the scanning line driving circuit 4 outputs a writing signal WS and a driving signal DS to the scanning line WSL for writing signal and the scanning line DSL for power supply provided in the display unit 2, respectively.
- the write signal WS is a signal for controlling on / off of a write transistor provided in each pixel circuit 5.
- the drive signal DS is a signal for controlling the drain voltage of the drive transistor provided in each pixel circuit 5.
- the scanning line drive circuit 4 generates a write signal WS and a drive signal DS by processing a predetermined sampling pulse SP with the clock CK in the write scan circuit (WSCN) 4A and the drive scan circuit (DSCN) 4B, respectively.
- FIG. 3 shows the configuration of the pixel circuit 5 in detail.
- the display unit 2 is formed by arranging the pixel circuits 5 shown in FIG. 3 in a matrix.
- the cathode of the organic EL element 8 is connected to a predetermined negative power source Vss, and the anode of the organic EL element 8 is connected to the source of the drive transistor Tr2.
- the drive transistor Tr2 is, for example, an N-channel transistor using TFTs.
- the drain of the drive transistor Tr2 is connected to the power supply scanning line DSL, and the power supply drive signal DS is supplied from the scanning line drive circuit 4 to the scanning line DSL.
- the organic EL element 8 is current-driven using the drive transistor Tr2 having a source follower circuit configuration.
- a holding capacitor Cs is provided between the gate and source of the drive transistor Tr2, and the gate side end voltage of the holding capacitor Cs is set to the voltage of the drive signal Ssig by the write signal WS.
- the organic EL element 8 is current-driven by the drive transistor Tr2 with the gate-source voltage Vgs corresponding to the drive signal Ssig.
- the capacitor Cel is a stray capacitance of the organic EL element 8. In the following description, it is assumed that the capacitance Cel is sufficiently larger than the retention capacitance Cs, and the parasitic capacitance of the gate node of the drive transistor Tr2 is sufficiently smaller than the retention capacitance Cs.
- the gate of the drive transistor Tr2 is connected to the signal line DTL via the write transistor Tr1 that is turned on / off by the write signal WS.
- the write transistor Tr1 is, for example, an N-channel transistor using TFTs.
- the signal line drive circuit 3 switches the gradation setting voltage Vsig and the threshold voltage correction voltage Vo at a predetermined timing and outputs a drive signal Ssig.
- the correction fixed voltage Vo is a fixed voltage used for correcting variation in the threshold voltage of the drive transistor Tr2.
- the gradation setting voltage Vsig is a voltage for instructing the light emission luminance of the organic EL element 8, and has a value obtained by adding the fixed voltage Vo for threshold voltage correction to the gradation voltage Vin.
- the gradation voltage Vin is a voltage corresponding to the light emission luminance of the organic EL element 8.
- the gradation voltage Vin is generated for each signal line DTL by sequentially latching the image data D1 input in the raster scan order in the horizontal selector (HSEL) 3A and distributing the image data D1 to each signal line DTL. Is done.
- the write transistor Tr1 is set to the off state by the write signal WS (FIG. 5A).
- the power supply voltage VccH is supplied to the drive transistor Tr2 by the power supply drive signal DS during the light emission period (FIG. 5B).
- the pixel circuit 5 causes the gate-source voltage Vgs of the drive transistor Tr2 (FIGS. 5D and 5E) to be the voltage between the terminals of the storage capacitor Cs during the light emission period.
- the organic EL element 8 is caused to emit light with the driving current Ids according to the above.
- the power supply drive signal DS is lowered to a predetermined fixed voltage VccL (FIG. 5B).
- the fixed voltage VccL is a voltage that is sufficiently low to cause the drain of the drive transistor Tr2 to function as a source and is lower than the cathode voltage Vss of the organic EL element 8.
- the accumulated charge at the end of the storage capacitor Cs on the organic EL element 8 side flows out to the scanning line DSL via the drive transistor Tr2.
- the source voltage Vs of the drive transistor Tr2 falls to the voltage VccL (FIG. 5E), and the light emission of the organic EL element 8 stops.
- the gate voltage Vg of the drive transistor Tr2 decreases in conjunction with the fall of the source voltage Vs (FIG. 5D).
- the write transistor Tr1 is switched on by the write signal WS (FIG. 5A), and the threshold voltage correction is performed in which the gate voltage Vg of the drive transistor Tr2 is set to the signal line DTL. Is set to a fixed voltage Vo (FIGS. 5C and 5D).
- the gate-source voltage Vgs of the drive transistor Tr2 is set to the voltage Vo ⁇ VccL.
- the voltage Vo ⁇ VccL is set to a voltage higher than the threshold voltage Vth of the drive transistor Tr2.
- the drain voltage of the drive transistor Tr2 is raised to the power supply voltage VccH by the drive signal DS (FIG. 5B).
- the charging current Ids flows from the power supply VccH into the organic EL element 8 side end of the storage capacitor Cs via the driving transistor Tr2.
- the voltage Vs on the organic EL element 8 side of the storage capacitor Cs gradually increases.
- the charging current Ids is used only for charging the capacitor Cel and the holding capacitor Cs of the organic EL element 8, and as a result, only the source voltage Vs of the drive transistor Tr2 rises without causing the organic EL element 8 to emit light. Will do.
- the write transistor Tr1 is set to the on state (FIG. 5A).
- the gate voltage Vg of the drive transistor Tr2 is set to the gradation setting voltage Vsig, and the gate-source voltage Vgs of the drive transistor Tr2 is set to the gradation voltage Vin.
- a voltage obtained by adding the threshold voltage Vth is set.
- the drive transistor Tr2 when the gate voltage Vg of the drive transistor Tr2 is set to the gradation setting voltage Vsig, the drive transistor Tr2 is maintained for a certain period while the drain voltage of the drive transistor Tr2 is held at the power supply voltage VccH. Are connected to the signal line DTL. Thereby, the variation in the mobility ⁇ of the driving transistor Tr2 is corrected.
- the write transistor Tr1 is set to the on state and the gate of the drive transistor Tr2 is connected to the signal line DTL.
- the gate voltage Vg of the transistor Tr2 gradually rises from the fixed voltage Vo and is set to the gradation setting voltage Vsig.
- the write time constant required for the rise of the gate voltage Vg of the drive transistor Tr2 is set to be shorter than the time constant required for the rise of the source voltage Vs by the drive transistor Tr2.
- the gate voltage Vg of the driving transistor Tr2 quickly rises to the gradation setting voltage Vsig (Vo + Vin).
- Vsig gradation setting voltage
- the gate-source voltage Vgs of the drive transistor Tr2 exceeds the threshold voltage Vth, the current Ids flows from the power supply VccH via the drive transistor Tr2, and the source voltage Vs of the drive transistor Tr2 gradually increases. become. As a result, the voltage between the terminals of the storage capacitor Cs is discharged by the drive transistor Tr2, and the rising speed of the gate-source voltage Vgs is reduced.
- the discharge rate of this inter-terminal voltage changes according to the capability of the drive transistor Tr2. More specifically, the discharge speed increases as the mobility ⁇ of the drive transistor Tr2 increases.
- the pixel circuit 5 is set such that the voltage across the storage capacitor Cs decreases as the driving transistor Tr2 has a higher mobility ⁇ , and the variation in light emission luminance due to the variation in mobility is corrected.
- the decrease in the inter-terminal voltage related to the correction of the mobility ⁇ is represented by ⁇ V in FIGS. 5, 12, and 13.
- the write signal WS falls at time t5.
- the organic EL element 8 emits light by the drive current Ids according to the voltage across the storage capacitor Cs.
- the gate voltage Vg and the source voltage Vs of the drive transistor Tr2 rise by a so-called bootstrap circuit.
- Vel in FIG. 13 represents the voltage corresponding to this increase.
- the pixel circuit 5 prepares for the process of correcting the threshold voltage of the drive transistor Tr2 during the period when the gate voltage of the drive transistor Tr2 is lowered to the voltage VccL from time t0 to time t1.
- the voltage across the storage capacitor Cs is set to the threshold voltage Vth of the driving transistor Tr2, and the threshold voltage of the driving transistor Tr2 is corrected.
- the mobility of the drive transistor Tr2 is corrected and the gradation setting voltage Vsig is sampled.
- FIG. 1 shows a layout of a wiring pattern in the pixel circuit 5.
- the pixel circuit 5 having the layout shown in FIG. FIG. 1 illustrates a state in which the upper layer member is removed from the anode electrode of the organic EL element 8 and the substrate side is viewed.
- the wiring patterns of each layer are represented by hatching differences.
- the interlayer contact 11 is represented by a circular mark
- the anode contact 12 is represented by a rectangular mark.
- hatching assigned to the wiring pattern of the connection destination is provided inside the circular mark (contact 11) to represent the connection relationship between the layers.
- a first wiring 10A is formed by forming a wiring pattern material layer on an insulating substrate made of glass, for example, and then etching the wiring pattern material layer. Subsequently, after a gate oxide film is formed, an intermediate wiring 10C made of a polysilicon film is formed.
- the first wiring 10A and the intermediate wiring 10C are formed so as to locally face each other in a substantially central region, and a storage capacitor Cs is formed by the facing parts. Subsequently, after a channel protective layer and the like are formed, a write transistor Tr1 and a drive transistor Tr2 are formed by doping impurities.
- the wiring pattern material layer is etched to form the second wiring 10B.
- the defect detection process described later is executed to repair the defective part. Subsequently, after a planarizing film is formed with a predetermined film thickness, an anode electrode of the organic EL element 8 is formed. Thereafter, the material film, the cathode electrode, and the protective film of the organic EL element 8 are sequentially formed, and then a transparent substrate for sealing is disposed.
- a signal line DTL extending in the vertical direction is formed on the left end side of the pixel circuit 5. Further, a power supply scanning line DSL and a writing signal scanning line WSL extending in the horizontal direction are formed above and below the pixel circuit 5, respectively.
- This type of image display device 1 is characterized in that the resistance value of the second wiring 10B is much smaller than that of the first wiring 10A. Specifically, the first wiring 10A has a sheet resistance value of about 50 times that of the second wiring 10B. In the image display device 1, it is necessary to reduce the impedance of the signal line DTL, the scanning line DSL, and WSL.
- the power supply scanning line DSL and the write signal scanning line WSL are formed by the second wiring 10B. Further, the power supply scanning line DSL is formed wider than the write signal scanning line WSL.
- the signal line DTL is formed by the second wiring 10B as much as possible. Specifically, the signal line DTL is formed by the first wiring 10A and the remaining signal line DTL is formed by the second wiring 10B only in the part intersecting with the scanning lines DSL and WSL. As a result, the signal line DTL is provided with contacts for connecting the first wiring 10A and the second wiring 10B with a portion intersecting the scanning lines DSL and WSL interposed therebetween.
- the power supply scanning line DSL at a portion where the signal line DTL and the power supply scanning line DSL intersect with each other is provided with a slit SL having a shape that cuts the signal line DTL across the signal line DTL.
- the slits SL are provided in two places that divide the power supply scanning line DSL into approximately three equal parts in the width direction, along with the direction in which the signal line DTL extends.
- the slit SL has both ends protruding from both end portions of the signal line DTL, and openings are formed at both ends so as to be sufficient for trimming using a laser beam.
- First and second contacts for ensuring connection with the first wiring 10A are provided.
- a wiring pattern BP for bypassing a portion where the signal line DTL and the write signal scanning line WSL intersect is formed by the wiring pattern of the first wiring 10A from the first and second contacts.
- the wiring pattern BP is a part different from a part where the signal line DTL and the writing signal scanning line WSL intersect, and the part where the signal line DTL is formed by the second wiring 10B.
- the first wiring 10A is formed so as to connect the first and second contacts across the signal line DTL.
- the wiring pattern BP is connected to the gate of the drive transistor Tr2 and assigned to the transmission path of the write signal WS.
- the wiring pattern of the first wiring 10A is formed so as to connect the gate of the writing transistor Tr1 and the corresponding first and second contacts with the writing transistor Tr1 in between. ing.
- a short-circuit portion between the wiring patterns is detected by the defect detection process, and the short-circuit portion detected in the subsequent repair process is repaired.
- a repair process is executed according to the detected short-circuit accident site.
- the short-circuited portion is trimmed by laser beam irradiation to repair the short-circuit location.
- the scanning line WSL for writing signal and the scanning line DSL for power supply are short-circuited at a portion other than a portion that intersects with the signal line DTL, the scanning line WSL Then, the space between the DSL and the DSL is trimmed by laser beam irradiation to repair the short-circuited portion.
- the scanning signal WSL for the write signal and the power supply line are provided at the portion intersecting the signal line DTL on the side opposite to the bypass wiring pattern BP.
- the scanning line DSL is short-circuited, as shown in FIG. 15, the short-circuited portion of the signal line DTL and the scanning line WSL is separated from the power-supply scanning line DSL using the slit SL, and the short-circuiting is performed. Repair the location. That is, in the slit SL on the side where the short circuit accident has occurred, the wiring pattern of the scanning line DSL is cut by laser trimming from the openings at both ends to the side where the short circuit accident has occurred, thereby repairing the short circuit portion.
- the center line of laser trimming is appropriately indicated by a broken line.
- connection diagram in FIG. 17 is an equivalent representation of the short-circuit accident indicated by these symbols A to C.
- the image is normally displayed on each line related to these scanning lines DSL and WSL. Becomes difficult and defects in the transverse muscles are observed.
- a defect is observed as a vertical bright line or black line.
- the signal line DTL and the write signal scanning line WSL are short-circuited on the bypass wiring pattern BP side due to the defect of the second wiring 10B.
- the wiring pattern of the scanning line WSL is cut by laser trimming on both sides of the location where the short-circuit accident has occurred and inside the first and second contacts, thereby repairing the short-circuit location. To do.
- the wiring pattern of the scanning line WSL is cut by laser trimming on both sides of the short-circuited part and inside the first and second contacts together with the short-circuited part, thereby repairing the short-circuited part.
- connection diagram shown in FIG. 21 is an equivalent representation of the short circuit accident indicated by these symbols D and E.
- the scanning line WSL and the signal line DTL are always connected with a predetermined impedance, and the pixel is observed as a defect.
- the image display device 1 After the image data D1 sequentially input is distributed to the signal lines DTL of the display unit 2 in the signal line driving circuit 3 (FIGS. 2 and 3), the digital / analog conversion process is performed. Is done. As a result, a gradation voltage Vin indicating the gradation of each pixel connected to the signal line DTL is formed for each signal line DTL. Further, the gradation voltage Vin is set to each pixel circuit 5 constituting the display unit 2 by, for example, line-sequential by driving the display unit by the scanning line driving circuit 4. The organic EL element 8 emits light by driving by the driving transistor Tr2 corresponding to the gradation voltage Vin (FIG. 4). Thereby, in the image display device 1, an image corresponding to the image data D1 can be displayed on the display unit 2.
- the organic EL element 8 is current-driven by the drive transistor Tr2 having a source follower circuit configuration. Further, the voltage at the gate side end of the storage capacitor Cs provided between the gate and the source of the drive transistor Tr2 is set to a voltage Vsig corresponding to the gradation voltage Vin. As a result, the organic EL element 8 emits light with the light emission luminance corresponding to the image data D1, and a desired image is displayed.
- the drive transistor Tr2 applied to the pixel circuit 5 has a drawback that the threshold voltage Vth varies greatly. Therefore, if the gate side end voltage of the storage capacitor Cs is simply set to the voltage Vsig corresponding to the gradation voltage Vin, the light emission luminance of the organic EL element 8 varies due to the variation of the threshold voltage Vth of the drive transistor Tr2, and the image quality Deteriorates.
- the voltage across the storage capacitor Cs becomes the threshold voltage Vth of the drive transistor Tr2 in advance by controlling the drive transistor Tr2 with the drive signal DS and the write signal WS. It is set (FIGS. 4 to 7). Thereafter, in the image display device 1, the terminal voltage of the storage capacitor Cs is set to the gradation setting voltage Vsig (Vin + Vo) (FIG. 11). As a result, it is possible to prevent image quality deterioration due to variations in the threshold voltage Vth of the drive transistor Tr2.
- the gate voltage of the drive transistor Tr2 is held at the gradation setting voltage Vsig while power is supplied to the drive transistor Tr2 for a certain time, thereby preventing image quality deterioration due to variation in mobility of the drive transistor Tr2. be able to.
- the image display device 1 when setting the gradation of each pixel circuit 5 by line sequential, it is necessary to accurately control the writing transistor Tr1 with the writing signal WS. Further, since the drive current of the organic EL element 8 is supplied via the power supply scanning line DSL, it is necessary to sufficiently reduce the voltage drop in the scanning line DSL. Therefore, in the image display device 1, it is necessary to sufficiently reduce the impedance of the scanning lines DSL and WSL. Further, it is necessary to sufficiently reduce the impedance of the signal line DTL.
- the pixel circuit 5 is formed by a laminated structure of the first wiring 10A, the intermediate wiring 10C, and the second wiring 10B with an interlayer insulating film or the like interposed therebetween (FIG. 1).
- the second wiring 10B has the lowest resistance value, so that the scanning line WSL for the write signal WS and the scanning line DSL for power supply are the second. It is formed by the wiring 10B.
- the power supply scanning line DSL is formed wider than the scanning line WSL for the write signal WS. Thereby, the impedance of the scanning line WSL and the power supply scanning line DSL can be sufficiently reduced.
- the signal line DTL is formed by wiring the first wiring 10A only at a portion that intersects the scanning line DSL and the scanning line WSL, and a portion that does not intersect the scanning line DSL and the scanning line WSL is formed by the second wiring 10B. Yes. Further, the signal line DTL is provided with a contact for connecting the first wiring 10A and the second wiring 10B with a portion intersecting the scanning line WSL interposed therebetween. As a result, the impedance of the signal line DTL can be sufficiently reduced.
- the short-circuited portion is repaired by trimming using a laser beam.
- a short-circuit accident at a location where the wiring pattern is not laminated can simply repair the short-circuit location by cutting the short-circuited location by laser trimming.
- FIG. 22 shows a configuration of the pixel circuit 15 in the case where no contrivance is made for the repair processing of the short-circuited portion.
- the power supply scanning line DSL is formed without the slit SL.
- the gate line of the drive transistor Tr2 is provided so as to simply extend from the write signal scanning line WSL.
- a slit SL having a shape crossing the signal line DTL is provided at a portion intersecting the signal line DTL (FIG. 1).
- the part where the short circuit accident has occurred is cut off from the scanning line DSL and the short circuit part is repaired (FIGS. 15 and 16).
- the method of providing this slit cannot be applied to the short-circuited portion (FIG. 18, symbol E) between the first wiring 10A of the signal line DTL and the gate line of the write transistor Tr1. Further, although it can be applied to a short-circuited portion (FIG. 18, reference numeral D) between the scanning line WSL and the second wiring 10B of the signal line DTL, it is necessary to form a wide pattern width of the scanning line WSL. Become. As a result, it becomes difficult to assign a sufficient pattern width to the power supply scanning line DSL, and it becomes difficult to sufficiently reduce the impedance of the power supply scanning line DSL.
- the drain voltage of the driving transistor Tr2 decreases as the distance from the scanning line driving circuit 4 increases, and shading occurs. Further, when the pattern width of the scanning line WSL for writing signals is increased, crosstalk increases, which may cause deterioration in image quality.
- the scanning line drive circuit 4 side and the opposite side to the scanning line drive circuit 4 are separated from the portion where the signal line DTL and the write signal scanning line WSL intersect by a distance sufficient for laser trimming.
- First and second contacts are provided at the scanning line WSL, and a bypass wiring pattern BP connecting the first and second contacts is formed by the first wiring 10A.
- a short-circuit portion between the scanning line WSL and the second wiring 10B of the signal line DTL (FIG. 19), and a short-circuit portion between the first wiring 10A of the signal line DTL and the gate line of the write transistor Tr1 (FIG. 20).
- Laser trimming cuts the contact, the signal line DTL, and the portion where the write signal scanning line WSL intersects.
- the first and second contacts including the first wiring 10A of the signal line DTL are short-circuited. Even when a large-scale short circuit accident occurs, the short circuit point can be repaired. As shown in FIG. 24, when the short circuit is not short-circuited immediately below the scanning line WSL, the short-circuited portion can be repaired by laser trimming the bypass wiring pattern side.
- the layout of the pixel circuit 5 can be simplified by setting the bypass wiring pattern BP to also serve as the gate line of the write transistor Tr1.
- the gate of the write transistor Tr1 is connected to the scanning line WSL via the bypass wiring pattern connected to the scanning line WSL by two contacts, one of the contacts is caused by a defect in the contact formation process. Even if a conduction failure occurs, the write signal WS can be supplied to the write transistor Tr1 through the other contact. Therefore, the reliability of the image display apparatus 1 can be improved as compared with the conventional case.
- the signal line is formed by the wiring pattern layer different from the scanning line only at the portion intersecting with the scanning line, and the signal line is formed by the same wiring pattern layer as the scanning line except for the portion intersecting with the scanning line. Since the wiring pattern that bypasses the intersecting portion is provided, the short-circuited portion between the wiring patterns generated at the intersecting portion can be repaired.
- the layout of the pixel circuit can be simplified, and the reliability of the image display device can be improved.
- FIG. 25 shows the layout of the display unit applied to the image display apparatus according to the second embodiment of the present invention in comparison with FIG.
- the image display apparatus according to the present embodiment has the same configuration as the image display apparatus 1 according to the first embodiment except that the layout shown in FIG. 25 is different.
- the reference numerals of the respective parts in the image display device according to the first embodiment will be used as appropriate.
- the odd-numbered pixel circuit 50 viewed from the scanning line driving circuit 4 and the subsequent even-numbered pixel circuit 5E are arranged so that the signal lines DTL face each other. That is, in the display unit 22, the odd-numbered pixel circuit 50 has the signal line DTL arranged along the left end. In the even-numbered pixel circuit 5E, the signal line DTL is arranged along the right end. Thus, the display unit 22 is disposed in the adjacent pixel circuits 5E and 50 so that the signal lines DTL are close to each other and face each other.
- the odd-numbered pixel circuit 50 and the even-numbered pixel circuit 5E are formed symmetrically with respect to the signal line DTL, so that the signal line DTL is connected in the adjacent pixel circuit 5E and the pixel circuit 50. They are arranged so as to face each other close to each other.
- the display unit 22 has a common wiring pattern for bypassing in the signal lines DTL arranged in close proximity. That is, the display unit 22 is opposite to the scanning line driving circuit 4 side and the scanning line driving circuit 4 from the part where the signal lines DTL arranged close to each other with a sufficient interval for laser trimming intersect the scanning line WSL. On the side, first and second contacts are provided.
- the display section 22 is formed by the first wiring 10A so that the bypass wiring pattern connecting the first and second contact sections collectively traverses the lower layers of the two opposing signal lines DTL. With this bypass wiring pattern, the write signal WS is supplied to each write transistor Tr1 of the adjacent pixel circuit.
- the first wiring 10A and the second wiring 10B are short-circuited between the scanning lines and the signal lines, respectively. Even when an accident occurs, the short-circuited portion can be reliably repaired. As shown in FIG. 28, even when one of the first and second contacts becomes defective in conduction, the write signal WS is supplied to the write transistor Tr1 through the other contact. Therefore, the reliability of the image display device 1 can be improved as compared with the conventional case.
- the adjacent pixel circuits are arranged so that the scanning lines are close to each other and face each other, and the wiring pattern for bypass is shared, so that it is much higher than the configuration of the first embodiment. While it can be set as a simple structure, the effect similar to 1st Embodiment can be acquired.
- the odd-numbered pixel circuit and the even-numbered pixel circuit are formed symmetrically with respect to the scanning line, so that the adjacent pixel circuit is arranged so that the scanning line is closely opposed to each other.
- Each pixel circuit can be laid out by mirroring.
- FIG. 29 shows the layout of the display unit applied to the image display apparatus according to the third embodiment of the present invention in comparison with FIG.
- the image display apparatus according to the present embodiment has the same configuration as that of the image display apparatus 1 according to the first embodiment, except that the layout shown in FIG. 29 is different.
- the write transistor Tr1 is disposed below the second wiring 10B of the signal line DTL. More specifically, the write transistor Tr1 in the pixel circuit 5 of FIG. 1 is rotated 90 degrees counterclockwise and disposed below the second wiring 10B of the signal line DTL. By changing the layout of the drive transistor Tr2, the shape of the storage capacitor CS and the like is corrected in the pixel circuit 25.
- the image display device effectively uses a configuration in which part of the signal line DTL is formed by the second wiring 10B, and blocks incident light to the writing transistor Tr1 by the signal line DTL of the second wiring 10B. can do.
- the light shielded by the signal line DTL is light of the organic EL element 8 provided in the pixel circuit, light of the organic EL element 8 provided in the adjacent pixel circuit, or the like.
- the drive transistor is arranged under the signal line, thereby preventing fluctuations in the characteristics of the drive transistor due to the incidence of extraneous light and the same effects as those of the first embodiment described above. Obtainable.
- FIG. 30 shows the layout of the display unit applied to the image display apparatus according to the fourth embodiment of the present invention in comparison with FIG.
- the image display apparatus according to the present embodiment is similar to that described above with reference to FIG. 29 in comparison with FIG. 1 except that the write transistor Tr1 is disposed below the second wiring 10B of the signal line DTL. It has the same configuration as the image display device 1 of the second embodiment.
- the driving transistor is arranged below the signal line, and the characteristics of the driving transistor vary due to the incidence of external light. Even if the above is prevented, the same effects as those of the second and third embodiments described above can be obtained.
- the second wiring 10B is preferentially used to arrange the signal line and the scanning line.
- the present invention is not limited to this.
- the resistance value of the first wiring 10A is lower than that of the second wiring 10B
- the first wiring 10A is used preferentially and the signal lines and scanning lines are used. May be arranged, and can be widely applied in this case.
- the present invention is not limited to this, and the color image 1
- the red, green, and blue subpixels that constitute a pixel may be used as a unit, and the subpixels may be selectively symmetrical.
- the green pixel circuit and the red and blue pixel circuits when the red pixel circuit and the green and blue pixel circuits are symmetrical, the green pixel circuit and the red and blue pixel circuits
- the red and green pixel circuits and the blue pixel circuit may have a symmetric shape.
- red, green, and blue sub-pixels constituting one pixel of a color image are used as units, and the sub-pixels are selectively symmetrical.
- the G (green) pixel circuit is defined as the first pixel circuit
- the B (blue) pixel circuit is defined as the second pixel circuit
- the R (red) pixel circuit is defined as the third pixel circuit in this order.
- FIG. 31 is a diagram showing a pattern layout of a pixel circuit as a comparative example in the present embodiment.
- the pixel pitch is asymmetric between RGB in the TFT layer.
- the layout shown in FIG. 31 exemplifies a case where the pattern area of the G pixel is small and the pattern area of the B pixel is large with respect to the R pixel.
- the layout of the B pixel circuit among the RGB pixel circuits is reversed horizontally with respect to the RG pixel circuit, so that the pattern density is almost equal in RGB.
- a bypass wiring pattern BP for repairing when the signal line DTL and the scanning line WSL are short-circuited is formed of the first metal wiring (see FIGS. 25 to 28).
- a wiring pattern BP is provided.
- the bypass wiring pattern BP provided in the B and R pixel circuits is not provided.
- FIG. 32 shows a timing chart for several stages in the pixel circuit in the comparative example.
- the scanning line WSL is switched five times in total, that is, three pulses for WS positive bias and threshold correction preparation and two pulses for threshold correction.
- FIG. 32 shows the timing of the RGB signal lines DTL-R, DTL-G, and DTL-B.
- the signal lines DTL-R and DTL-B scan with the signal lines DTL-R and DTL-B.
- the parasitic capacitance of the line WSL is larger than that of DTL-G.
- the scanning line WSL is provided with a bypass wiring pattern BP, and the signal lines DTL-B and DTL-R are connected to the bypass line pattern BP. This is because a parasitic capacitance is generated at the intersection with the wiring pattern BP. For this reason, capacitive coupling due to potential fluctuation of the scanning line WSL is larger in DTL-R and DTL-B than in DTL-G, and noise is generated in the offset potential in the threshold correction preparation period and the threshold correction period. become.
- FIG. 33 shows a pattern layout of the pixel circuit in the present embodiment.
- the pixel pitch is asymmetric between RGB in the TFT layer.
- a bypass wiring pattern BP for repairing when the signal line DTL and the scanning line WSL are short-circuited is formed of the first metal wiring (see FIGS. 25 to 28).
- Wiring pattern BP is provided.
- a pseudo wiring pattern FP is provided instead of the bypass wiring pattern BP provided in the B and R pixel circuits.
- the pseudo wiring pattern FP is a wiring pattern that is electrically connected to the scanning line WSL.
- the wiring pattern of the signal line DTL-G is different from the intersection of the scanning line WSL and the signal line DTL-G in the upper layer or the lower layer. It is something that crosses.
- a parasitic capacitance is generated between the pseudo pattern FP and the signal line DTL-G.
- parasitic capacitance is generated between the bypass wiring pattern BP and the signal lines DTL-B and DTL-R. That is, the same parasitic capacitance is generated in all the RGB pixel circuits.
- FIG. 34 shows a timing chart in the pattern layout of the present embodiment.
- the amount of capacitive coupling due to the potential variation of the scanning line WSL becomes equal, and the same noise is generated in each video signal reference potential Vo, whereby luminance unevenness can be prevented.
- the bypass wiring pattern BP is provided in the B and R pixel circuits, and the pseudo wiring pattern FP is provided in the G pixel circuit, so that the scanning lines WSL and the signal lines DTL
- the parasitic capacitance formed between the signal lines is uniform for each signal line. For this reason, it is possible to reduce the variation in the amount of capacitive coupling between the pixels due to the potential fluctuation of the scanning line WSL and to prevent luminance unevenness.
- a bypass for bypassing the intersection of the scanning line WSL and the signal line DTL-G may be provided.
- the present invention is not limited thereto, and is widely used when the image display device is configured by various pixel circuits. Can be applied.
- the present invention by decreasing the drain voltage of the driving transistor, the voltage at the side of the organic EL element of the storage capacitor is decreased, and thereby the voltage between the terminals of the storage capacitor is reduced.
- the present invention is not limited to this.
- the organic EL element side end of the storage capacitor is separately connected to a predetermined fixed voltage via a switching transistor. Therefore, the present invention can be widely applied to the case where the voltage across the storage capacitor is set to a voltage higher than the threshold voltage of the driving transistor.
- the gate voltage of the driving transistor is set to a fixed voltage for threshold voltage correction via the signal line, whereby the voltage across the storage capacitor is set to the threshold voltage of the driving transistor.
- the present invention is not limited to this.
- the gate voltage of the drive transistor is set to a fixed voltage via a switching transistor, and the voltage across the storage capacitor is thereby reduced.
- the present invention can also be widely applied when the voltage is set to be equal to or higher than the threshold voltage of the driving transistor.
- the present invention is applied to the image display device of the self-light emitting element by the organic EL element.
- the present invention is not limited thereto, and the image display device by various self-light emitting elements, Further, it can be widely applied to image display devices using liquid crystal or the like.
- the present invention can be applied to, for example, an active matrix type image display device using organic EL elements.
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Abstract
Description
1.第1実施の形態(バイパス用の配線パターンを備える例)
2.第2実施の形態(隣接画素回路の信号線が向かい合う例)
3.第3実施の形態(書込トランジスタが信号線の下に配置された例)
4.第4実施の形態(第2実施の形態において書込トランジスタが信号線の下に配置された例)
5.第5実施の形態(走査線側を信号線の下層に配置する例)
6.第6実施の形態(擬似配線パターンを備える例)
(1)構成
(1-1)全体構成(図2~図13)
図1は、画素回路5における配線パターンのレイアウトを表すものである。画像表示装置1は、この図1に示したレイアウトによる画素回路5が繰り返し配置されて表示部2が作成される。なお、図1は、有機EL素子8のアノード電極から上層の部材を除去して基板側を見た状態を表すものである。ここでは、各層の配線パターンをそれぞれハッチングの相違により表している。また、円形の印により層間のコンタクト11、矩形の印によりアノード用のコンタクト12を表している。更に、この円形の印(コンタクト11)の内側に接続先の配線パターンに割り当てたハッチングを設け、層間の接続関係を表している。
図25は、図1との対比により本発明の第2実施の形態の画像表示装置に適用される表示部のレイアウトを表すものである。本実施の形態の画像表示装置は、図25に示したレイアウトが異なる点を除いて、第1実施の形態の画像表示装置1と同一の構成を有する。以下の説明においては、適宜、第1実施の形態の画像表示装置における各部の符号を流用して説明する。
図29は、図1との対比により本発明の第3実施の形態の画像表示装置に適用される表示部のレイアウトを表すものである。本実施の形態の画像表示装置は、図29に示したレイアウトが異なる点を除いて、第1実施の形態の画像表示装置1と同一の構成を有する。
図30は、図25との対比により本発明の第4実施の形態の画像表示装置に適用される表示部のレイアウトを表すものである。本実施の形態の画像表示装置は、図1との対比により図29について上述したと同様に、書込トランジスタTr1が、信号線DTLの第2配線10Bの下に配置される点を除いて、第2実施の形態の画像表示装置1と同一の構成を有する。
上述の実施の形態においては、信号線と電源用および書込信号用の走査線が交差する部位において、信号線を下層側に配置する場合について述べたが、本発明はこれに限らず、走査線側を信号線の下層に配置するようにしてもよい。
第6実施の形態は、上記のように、カラー画像の1画素を構成する赤色、緑色、青色のサブ画素を単位にして、このサブ画素を選択的に対称形状とした例である。なお、ここでは、G(緑色)の画素回路を第1の画素回路、B(青色)の画素回路を第2の画素回路、R(赤色)の画素回路を第3の画素回路として、この順に並列配置されているユニット(組み)を例とする。また、このユニットにおいて、第2の画素回路であるBの画素回路と第3の画素回路であるRの画素回路とが対称形状となっている例を説明する。
Claims (9)
- 画素回路をマトリックス状に配置して形成された表示部により画像を表示する画像表示装置であって、
前記表示部の走査線または信号線は、
前記信号線または走査線と配線パターンが交差する部位を除いて、前記信号線または走査線の配線パターンと同一層に配線パターンが形成され、
前記交差する部位では、前記信号線または走査線の配線パターンとは異なる層に配線パターンが形成され、
前記走査線には、
前記交差する部位とは異なる部位で前記信号線の配線パターンを上層または下層で横切って、前記交差する部位をバイパスするバイパス用の配線パターンが設けられた
画像表示装置。 - 前記画素回路には、前記信号線の電圧により階調を設定する書込トランジスタが設けられ、
前記バイパス用の配線パターンにより前記書込トランジスタのゲートが前記走査線に接続された
請求項1に記載の画像表示装置。 - 隣接する1組の前記画素回路では、前記信号線の配線パターンが近接して対向するように配置され、
前記バイパス用の配線パターンが、前記1組の画素回路における前記信号線の配線パターンを横切って、前記1組の画素回路における前記交差する部位をまとめてバイパスする配線パターンである
請求項2に記載の画像表示装置。 - 前記1組の画素回路が、前記信号線の配線パターンに対して対称形状に形成された
請求項3に記載の画像表示装置。 - 前記書込トランジスタが前記信号線の配線パターンの下に配置された
請求項2に記載の画像表示装置。 - 前記画素回路は、
自発光素子と、
電源用の走査線により供給される電源により前記自発光素子を駆動する駆動トランジスタと、
前記駆動トランジスタのゲート・ソース間電圧を保持する保持容量とを有し、
前記書込トランジスタが、前記保持容量の端子電圧を前記信号線の電圧により設定するトランジスタであり、
前記走査線および信号線による制御により前記保持容量の端子間電圧を前記駆動トランジスタのしきい値電圧に設定した後、前記保持容量の端子電圧を前記書込トランジスタにより前記信号線の電圧に設定して前記自発光素子の発光輝度を設定する
請求項3に記載の画像表示装置。 - 前記画素回路は、
自発光素子と、
電源用の走査線により供給される電源により前記自発光素子を駆動する駆動トランジスタと、
前記駆動トランジスタのゲート・ソース間電圧を保持する保持容量とを有し、
前記書込トランジスタが、前記保持容量の端子電圧を前記信号線の電圧により設定するトランジスタであり、
前記走査線および信号線による制御により前記保持容量の端子間電圧を前記駆動トランジスタのしきい値電圧に設定した後、前記保持容量の端子電圧を前記書込トランジスタにより前記信号線の電圧に設定して前記自発光素子の発光輝度を設定する
請求項5に記載の画像表示装置。 - 複数の前記画素回路において第1、第2、第3の画素回路が順に並列配置される組について、隣接する第2、第3の画素回路では、前記信号線の配線パターンが近接して対向するように配置され、
前記バイパス用の配線パターンが、前記第2、第3の画素回路における前記信号線の配線パターンを横切って、前記第2、第3の画素回路における前記交差する部位をまとめてバイパスする配線パターンであり、
第1の画素回路では、前記バイパス用の配線パターンの代わりに、前記走査線と導通する配線パターンであって、前記走査線と前記交差する部位とは異なる部位で前記信号線の配線パターンを上層または下層で横切る擬似配線パターンである
請求項2に記載の画像表示装置。 - 画素回路をマトリックス状に配置して形成された表示部により画像を表示する画像表示装置における短絡事故の修復方法であって、
前記表示部の走査線または信号線は、
前記信号線または走査線と交差する部位を除いて、前記信号線または走査線の配線パターンと同一層の配線により配線パターンが形成され、
前記交差する部位では、前記信号線または走査線の配線パターンと異なる層の配線により配線パターンが形成され、
前記走査線には、
前記交差する部位とは異なる部位で前記信号線の上層または下層を横切って、前記交差する部位をバイパスするバイパス用の配線パターンが設けられ、
前記走査線の切断により、前記交差する部位を前記バイパス用の配線パターンから切り離して、前記信号線および走査線間の短絡箇所を修復する
短絡事故の修復方法。
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