WO2006043545A1 - スペーサ形成方法及びスペーサ形成装置 - Google Patents
スペーサ形成方法及びスペーサ形成装置 Download PDFInfo
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- WO2006043545A1 WO2006043545A1 PCT/JP2005/019114 JP2005019114W WO2006043545A1 WO 2006043545 A1 WO2006043545 A1 WO 2006043545A1 JP 2005019114 W JP2005019114 W JP 2005019114W WO 2006043545 A1 WO2006043545 A1 WO 2006043545A1
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- spacer
- ink
- nozzle
- nozzles
- spacer forming
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
-
- 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
- G02F1/1339—Gaskets; Spacers; Sealing of cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
-
- 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
- G02F1/1339—Gaskets; Spacers; Sealing of cells
- G02F1/13394—Gaskets; Spacers; Sealing of cells spacers regularly patterned on the cell subtrate, e.g. walls, pillars
-
- 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
- G02F2203/00—Function characteristic
- G02F2203/69—Arrangements or methods for testing or calibrating a device
Definitions
- the present invention relates to a method of forming a spacer for keeping a liquid crystal sealing gap between a pair of substrates used in a liquid crystal panel constant. More specifically, the present invention relates to an ink in which a spacer is dispersed in a solvent. The present invention relates to a spacer forming method and a spacer forming apparatus using an ink jet method (droplet discharge method) of dropping at an upper spacer forming position.
- the response characteristics, contrast, and viewing angle required for a liquid crystal panel largely depend on the thickness of the liquid crystal layer.
- a spacer is interposed in the gap between the pair of substrates in which the liquid crystal is sealed to control the thickness of the liquid crystal layer to be constant.
- a method of forming a spacer a method of forming a columnar shape on one substrate, a method of spraying ball-shaped spacers, and the like are known.
- the method of forming a spacer in a columnar shape requires steps such as film formation and etching by photolithography, which requires many steps and is costly and laborious.
- ball spacers can be sprayed onto the substrate by wet spraying, or by spraying powder spacers directly onto the substrate using an air stream such as compressed dry nitrogen.
- spacers may be scattered in the pixel area, resulting in reduced brightness or uneven brightness, uneven spacer distribution on the substrate, and uneven substrate gaps. .
- Patent Document 1 proposes a technique for easily forming a spacer locally by an inkjet method in a black matrix of a color filter that is a non-pixel region.
- a spacer-containing ink in which ball-shaped spacers are dispersed in a solvent is dropped on a nozzle black matrix, and the solvent is evaporated, whereby the spacers are formed on the black matrix.
- Patent Document 2 observes ink ejected with a nozzle force with a camera or an image processing apparatus, and determines the ejection speed and ejection direction of the flying ink. taking measurement. If the measured value is outside the set range, it is determined that the discharge is abnormal, and nozzle cleaning is performed.
- Patent Document 1 Japanese Patent Laid-Open No. 11 24083
- Patent Document 2 Japanese Patent Laid-Open No. 11-316380
- the present invention has been made in view of the above problems, and an object thereof is to provide a spacer forming method capable of forming a spacer reliably within a predetermined range.
- Another object of the present invention is to provide a normal nozzle force spacer for all spacer formation positions without performing tallying when an abnormal nozzle is generated. It is an object of the present invention to provide a spacer forming method and a spacer forming apparatus capable of dripping ink containing ink.
- the present invention employs the following configuration in order to solve the above-described problems.
- ink in which granular spacers for maintaining a liquid crystal sealing gap formed between a pair of substrates are dispersed is applied to a plurality of spacers on one substrate. It is characterized in that a spacer is formed at each spacer formation position by dropping a plurality of droplets at each position of the spacer formation position.
- the ink amount required for each position where the spacer is formed is dropped in a plurality of drops instead of being dropped all at once, the drop amount per drop can be reduced. , It is possible to reliably drop in a desired narrow range while suppressing the spread after dropping. further
- the spacer is present in the pixel area, liquid crystal alignment failure, light leakage, and the like are caused and the display image quality is greatly deteriorated. Therefore, in the non-pixel area that does not directly contribute to display. It is preferable to form. In particular, if ink is dripped onto the intersections of the grid-like non-pixel areas surrounding each pixel, the ink drops that have a relatively large area in the non-pixel areas, and the dropped ink protrudes from the intersections. And hard to meet.
- ink is dropped onto a plurality of spacer formation positions using an inkjet head having a plurality of nozzles, the spacers can be formed at a plurality of positions at the same time, resulting in good productivity.
- multiple drops of ink can be dropped by a nozzle with the same spacer formation position. If a plurality of drops of ink are dropped while changing the corresponding positional relationship between each nozzle and each spacer formation position as shown in FIG. Spacer formation positions that are not dripped are prevented from occurring, and a spacer can be reliably formed at each spacer formation position.
- the step of performing a test discharge for confirming the presence or absence of discharge abnormality before discharging the spacer-containing ink to the spacer forming position on the substrate If there is a nozzle with abnormal discharge in this test discharge, the spacer-containing ink is discharged from the normal nozzle without discharging the spacer-containing ink from the abnormal nozzle. Shift the position of each nozzle to the position where each nozzle is formed and the corresponding position of each nozzle with respect to each spacer formation position. And a step of discharging the spacer-containing ink from the normal nozzle and dropping it at the position where the spacer is formed.
- the spacer forming apparatus of the present invention is a discharge observing unit that observes the discharge of the spacer-containing ink from the nozzle, and a discharge that determines a discharge abnormality based on the observation result of the discharge observing unit. Discharge the spacer-containing ink from the normal nozzle without discharging the spacer-containing ink with the nozzle force determined to be abnormal discharge, and drop it at the position where the spacer is formed on the substrate.
- ink discharge is performed a plurality of times on the substrate while shifting the corresponding position between the abnormal nozzle and the spacer formation position on the substrate.
- the spacer formation position receives ink dripping from the normal nozzle at least once, and prevents the defective formation of the spacer from forming in a line corresponding to the abnormal nozzle position.
- the spacer forming method of the present invention since a plurality of drops of the spacer-containing ink are dropped at each position of the plurality of spacer forming positions, the spacer does not reach the pixel. Within range The required number of spacers can be reliably formed. As a result, the thickness of the liquid crystal layer can be kept constant, and the influence of the spacer itself on the display image quality can be suppressed to improve the quality of the liquid crystal panel.
- the ink is ejected to the substrate a plurality of times while shifting the corresponding position between the abnormal nozzle and the spacer formation position on the substrate, the production efficiency by performing cleaning is increased. Therefore, it is possible to avoid a formation failure of the spacer that does not cause a decrease in the liquid crystal and to stably maintain a desired liquid crystal filling gap. As a result, the thickness of the liquid crystal layer can be kept constant and good display quality can be obtained.
- FIG. 1 is a plan view showing a position at which a spacer-containing ink is dropped onto a substrate (spacer formation position) in an embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing ink dropping from each nozzle of an inkjet head onto a substrate.
- FIG. 3 is a schematic plan view showing a spacer forming method according to a second embodiment of the present invention.
- FIG.4 Shows the probability of n spacers being included in a drop after the ink has been dropped once (1 drop), twice (2 drops), and 3 times (3 drops). It is a graph.
- FIG. 5 is a schematic plan view showing an example of a discharge pattern according to a third embodiment of the present invention.
- FIG. 6 is a schematic plan view showing an example of a discharge pattern according to a fourth embodiment of the present invention.
- FIG. 7 is a schematic plan view showing an example of a discharge pattern according to a fifth embodiment of the present invention.
- FIG. 8 is a schematic plan view showing an example of a discharge pattern according to a sixth embodiment of the present invention.
- FIG. 9 is a block diagram showing a configuration of a spacer forming device according to a seventh exemplary embodiment of the present invention.
- FIG. 10 is a flowchart showing the flow of a spacer forming method according to a seventh embodiment of the present invention.
- FIG. 11 is a diagram showing an example (part 1) of an ejection pattern according to a seventh embodiment of the present invention.
- FIG. 12 is a diagram showing a discharge pattern example (part 2) according to the seventh embodiment of the present invention.
- FIG. 13 is a view showing a discharge pattern example (part 3) according to the seventh embodiment of the present invention.
- FIG. 14 is a view showing a discharge pattern example (part 4) according to the seventh embodiment of the present invention.
- FIG. 15 is a view showing a discharge pattern example (part 5) according to the seventh embodiment of the present invention.
- 16 It is a diagram showing a discharge pattern example (No. 6) according to the seventh embodiment of the present invention.
- FIG. 17 is a schematic plan view showing a discharge pattern example of a conventional example.
- a liquid crystal panel is configured by enclosing liquid crystal in a gap of about several meters formed between a pair of substrates.
- One of the pair of substrates is configured by forming a polarizing plate, a color filter, a counter electrode, an alignment film, and the like on a glass substrate.
- the other is configured by forming a polarizing plate, a pixel electrode, a driving transistor, an alignment film, and the like on a glass substrate.
- the two substrates are bonded together with the alignment films facing each other.
- a sealing material for laminating both substrates together is applied to one substrate, and the sealing material is applied to form a spacer on the other substrate.
- the spacer is formed on a color filter side substrate having a color filter.
- the color filter has a grid-like black matrix 5 and a red pixel R, a green pixel G, and a blue pixel B formed in each of the grid's eyes.
- Black matrix 5 is a non-pixel area that surrounds each pixel of RGB so that it is blackened, and always blocks light from the backlight regardless of whether the voltage applied to the liquid crystal cell is on or off.
- the spacer is contained in the ink, and the spacer-containing ink 7 is dropped onto a plurality of intersecting portions (spacer formation positions) in the grid-like black matrix 5 by an ink jet method. Note that the spacer-containing ink 7 is not directly dropped on the black matrix 5, but the substrate 1 on which the spacer is formed is located on the portion of the black matrix 5 in the portion (alignment film) facing the other substrate. Dropped at the position corresponding to the intersection (overlapping position).
- the spacer-containing ink 7 includes a solvent such as water or alcohol and a spacer dispersed in the solvent.
- the spacer is a spherical plastic, glass, silica or the like having a diameter (for example, 4 to 5 ⁇ m) corresponding to the gap between the two substrates (liquid crystal sealing gap).
- the viscosity, fluidity, volatility, spacer dispersion density in the solvent, etc. are adjusted to be suitable for dropping by the ink jet method.
- the spacer-containing ink 7 includes a plurality of spacer formation positions on the substrate 1 using an inkjet head 3 having a plurality (nine in this example) of nozzles nl to n9. It is dripped in.
- the spacer-containing ink 7 can be dropped simultaneously at nine spacer forming positions to form a spacer.
- the spacer-containing ink 7 When the spacer-containing ink 7 is dropped on the spacer formation position, the solvent is naturally evaporated or calothermally evaporated, and the spacer remains at the spacer formation position. At this time, the peripheral force of the droplet dropped at the position where the spacer is formed gradually evaporates and the central portion of the droplet becomes smaller. A spacer is placed near the center of the drop.
- a desired number of spacers are formed at each position where the spacers are formed. Do not drop the amount of ink 7 needed to make it all at once. That is, the ink 7 is dropped a plurality of times per one position where the spacer is formed. As a result, the drop volume per drop can be reduced compared to the conventional case, and the spread of the dropped ink 7 can be suppressed correspondingly, and the spacer is kept within a predetermined range (with the black matrix 5). It can be formed so as to surely fit within the area. As a result, it is possible to prevent the formation of spacers at each RGB pixel, which is a light transmission part that contributes to display, and to prevent deterioration in display image quality.
- the dropping of a plurality of drops of ink 7 at a single spacer formation position depends on the volatility of the ink 7, the dropping time interval of each drop, the surrounding environment, and the like.
- the next droplet may be dropped before the first droplet dries (the solvent evaporates), or the next droplet may drop after the previous droplet dries.
- the ink 7 may be dropped on a line-shaped portion other than the intersecting portion of the black matrix 5.
- a TFT Thin Film Transistor
- the dimensions are generally larger. Therefore, if the spacer-containing ink 7 is dropped at the intersection where the black matrix 5 is relatively wide, the spacer will not spread to the pixels!
- the drop amount of ink 7 is an average of 5.5 pl, and an average of 1.3 spacers per drop (a drop) is used. Includes sa.
- the amount of one drop is 10 pl or less.
- the amount of one drop is too small, no one spacer is included in each drop, so there is a possibility that the amount of one drop (the amount of one drop) is 5 pl or more. Preferably there is.
- the graph of Fig. 4 shows that when the spacer-containing ink 7 is dropped once (1 drop), twice (2 drops), and 3 times (3 drops) in the same location, n spacers are added. It is a graph which shows the probability that a process will be formed. Snow In other words, the probability that the number of spacers shown on the horizontal axis is included in the ink 7 after dropping is shown on the vertical axis as a percentage. The drop volume per one time (1 drop) was about 5.5 pl.
- the number of spacers is 0, that is, the case where there is no spacer in the liquid drop after the drop occurs with a probability of about 29%.
- the probability when the number of spacers is zero is 10% or less
- the probability when the number of spacers is zero is 2% or less. It has become.
- the amount of one drop is smaller than that in the past in order to suppress the spread after the drop, so that only one drop (one drop) is required for the scan.
- the probability that the spacer is not contained in the droplet after dropping can be greatly reduced, so that the spacer can be surely formed at each spacer forming position.
- the spacer-containing ink 7 is dripped aiming at a very narrow region, so the nozzle diameter is very small and the ink 7 may be clogged and clogged. Since the spacer-containing ink 7 is not dripped from the blocked nozzle, the ink 7 is dripped from the same nozzle every time, either at the first, second, or ⁇ times. If the nozzle corresponding to the spacer formation position is clogged in the receiving configuration, no ink 7 is dropped on the spacer formation position, and therefore the spacer formation position Spacers will no longer be formed in the case.
- the nozzles ⁇ 7, ⁇ 8, and ⁇ 9 forces correspond to the first row spacer formation position, the second row spacer formation position, and the third row spacer formation position, respectively. Being positioned The start position (positioned along the row direction of the spacer formation position (the horizontal direction in the figure)
- the inkjet head 3 at the first position is moved in the inkjet head scanning direction indicated by the arrow.
- the spacer-containing ink 7 is dropped from the nozzle n7 to the spacer formation position of the first row, and the spacer-containing ink 7 is dropped from the nozzle n8 to the spacer formation position of the second row.
- the spacer-containing ink 7 is dropped from the nozzle n9 at the spacer formation position in the third row.
- the number of nozzles, the number of rows and the number of columns at the spacer formation position are examples, and are not limited to the numbers shown in FIG. Further, as long as the inkjet head 3 and the substrate 1 can be moved relative to each other, the substrate 1 may be moved in the direction opposite to the arrow instead of moving the inkjet head 3 in the arrow direction.
- the inkjet head 3 is shifted from the start position by, for example, three nos and nos in the row direction (right direction in the figure), and the nose ⁇ 4, ⁇ 5, ⁇ 6, ⁇ 7, ⁇ 8, and ⁇ 9 forces are respectively 1st Ij spacer formation position, 2nd row spacer formation position, 3rd row spacer formation position, 4th row spacer formation position, 5th row spacer formation position.
- the ink jet head 3 is set in the second position positioned corresponding to the spacer formation position in the sixth row, and the ink jet head 3 is moved in the ink jet head scanning direction indicated by the arrow.
- the spacer-containing ink 7 is dripped from the nozzle n4 to the spacer formation position of the first row, and the spacer-containing ink 7 is applied from the nozzle n5 to the spacer formation position of the second row. Then, from the nozzle n6, the spacer-containing ink 7 is dropped at the third row spacer formation position, and from the nozzle n7, the spacer-containing ink 7 is dropped at the fourth row spacer formation position.
- the nozzle-containing ink 7 is dropped from the nozzle n8 onto the spacer formation position of the fifth row, and the spacer-containing ink 7 is dropped from the nozzle n9 onto the spacer formation position of the sixth row.
- the spacer formation positions in the 1st to 3rd rows receive the second ink drop, but each receives a drop of ink from a different nozzle than the one that received the drop first.
- the inkjet head is shifted from the second position by, for example, three nos and threes in the row direction (right direction in the figure), and nos, nos nl, ⁇ 2, ⁇ 3, ⁇ 4, ⁇ 5, ⁇ 6, ⁇ 7, ⁇ 8, ⁇ 9 forces, 1st row spacer formation position, 2nd row spacer formation position, 3rd row spacer formation position, 4th row spacer formation position , 5th row spacer formation position, 6th row spacer Set to the third position that is positioned corresponding to the spacer formation position, the seventh row spacer formation position, the eighth row spacer formation position, and the ninth row spacer formation position.
- the etch head 3 is moved in the inkjet head scanning direction indicated by the arrow.
- the spacer-containing ink 7 is dropped from the nozzle nl to the spacer formation position of the first row, and the spacer-containing ink 7 is dropped from the nozzle n2 to the spacer formation position of the second row. Then, the spacer-containing ink 7 is dropped from the nozzle n3 to the spacer formation position of the third row, and the spacer-containing ink 7 is dropped from the nozzle n4 to the spacer formation position of the fourth row.
- Nozzle n5 force drops the spacer-containing ink 7 at the spacer formation position of the fifth row, and from the nozzle n6, the spacer-containing ink 7 drops at the spacer formation position of the sixth row.
- the n7 force drops the spacer-containing ink 7 at the spacer formation position of the seventh row, and the nozzle-containing ink 7 is dropped at the spacer formation position of the eighth row from the nozzle n8.
- the spacer-containing ink 7 is dropped on the spacer formation position in the ninth row.
- the spacer formation position in the 1st to 3rd rows receives the third ink drop, but the nozzle force is different from the nozzle that received the first and second drops.
- the force to receive the second ink drop receives the ink drop from a nozzle different from the nozzle that received the first drop.
- the same number of ink drops is applied to all spacer formation positions on the substrate 1.
- the ink 7 can be dropped from a different nozzle to a single spacer formation position a plurality of times (a plurality of drops). Spacer formation position where no drops are dropped does not occur. Therefore, it is possible to reduce the possibility of forming a spacer formation position where no spacer is formed.
- the method of changing the corresponding positional relationship between each nozzle nl to n9 and each spacer formation position is not limited to the above, and the inkjet head 3 is arranged along the column direction of the spacer formation position. It is also possible to scan in the row direction, and at this time, the nozzles may be shifted in the column direction for each drop. Alternatively, after scanning in the column direction and dropping, change the direction of the inkjet head 3 by 90 ° and scan in the row direction to drop.
- the spacer-containing ink 7 includes a plurality of spacers on the substrate 1 using a line head type inkjet head 3 having a plurality of nozzles nl to n9 arranged in a line. Dropped at the formation position.
- a spacer can be formed by simultaneously dropping the spacer-containing ink 7 at a plurality of spacer forming positions along the direction in which the nozzles nl to n9 are arranged.
- the spacer-containing ink 7 is dropped from the nozzles nl to n9 while the inkjet head 3 and the substrate 1 are relatively moved in the direction perpendicular to the nozzle parallel direction.
- the substrate 1 is moved in a direction orthogonal to the nozzle parallel direction with respect to the stationary inkjet head 3.
- the inkjet head 3 may be moved with respect to the stationary substrate 1, or both may be moved.
- a trial ejection is performed on the dummy substrate to confirm the presence or absence of ink ejection abnormality for each nozzle.
- the ejection observation means observes ink ejection from each nozzle.
- the ejection observing means also has power such as a laser optical system, a camera, and an image processing device.
- An ink observation trajectory is established by setting a discharge observation unit at the head maintenance position and moving the head to the discharge observation position and photographing the ink droplets discharged from the nozzles with a camera while blinking the laser light at predetermined time intervals. Is obtained as a still image.
- This image is processed by the image processing apparatus, and the ink ejection speed and ejection angle are calculated. Based on these values, it is determined whether there is an ejection abnormality.
- the ejection observation means may be moved to a predetermined position or moved to the observation position of the installed head, and the ink ejected from the nozzle and landing on the dummy substrate may be observed to determine whether or not the ejection is abnormal.
- the nozzles are completely clogged and no ink is ejected, an image of the ink flight trajectory cannot be obtained. Of course, this is also an abnormal discharge.
- the state in which ink is ejected from the nozzles may be photographed as a moving image, and the ejection speed and the ejection angle may be calculated from the moving image data.
- a threshold value of the ink ejection speed Vd from the nozzle is set.
- nozzles Nos. 8 and 17 are determined as abnormal discharge nozzles. Nozzle No.17 No ink is ejected from these nozzles, and the ejection speed and angle cannot be observed.
- the discharge angle ⁇ corresponds to the inclination angle of the ink flight trajectory from the straight line connecting the center of the nozzle and the center of the spacer formation position corresponding to the nozzle (perpendicular to the nozzle cover and the substrate). .
- the ejection abnormality may be determined by the amount of deviation from the reference position of the ink landing position (position where the nozzle force has landed directly below)! /.
- D is the shortest distance along the vertical direction between the nozzle and the substrate (the length of the straight line connecting the center of the nozzle and the center of the spacer forming position corresponding to this nozzle), for example, 0.5 mm It is.
- ⁇ is the inclination angle of the ink flight trajectory from the straight line connecting the center of the nozzle and the center of the spacer formation position corresponding to this nozzle.
- Vs XD / Vd the amount of landing position deviation in the direction along the relative movement direction.
- Vs is the moving speed of the substrate with respect to the stationary inkjet head, for example, 200 mmZ seconds.
- D, Vd are as described above.
- the ejection abnormality may be determined based on the value of D Xtan ⁇ + Vs X DZVd.
- each nozzle force is ejected while the substrate 1 is moved in the direction of the arrow shown in the figure (a direction perpendicular to the nozzle parallel direction) with respect to the stationary inkjet head 3 to form a spacer on the substrate 1. It is dripped at the position. At the end of the first discharge, ink and spacers contained therein are dropped at the spacer formation positions in the eighth and 17th rows corresponding to the abnormal nozzles. The state.
- the inkjet head 3 is moved to the right by one nozzle in FIG. 5, and the normal nozzle of nozzle No. 7 is moved to the spacer formation position in the eighth row, and the spacer in the 17th row. Associate normal nozzle No. 16 with the forming position. Either the inkjet head 3 or the substrate 1 may be moved as long as the nozzle and the substrate 1 are relatively displaced in the nozzle parallel direction.
- the second ink discharge is performed on the substrate 1 in the same manner as the first time. At this time, ink is ejected only from nozzles No. 7 and No. 16, and ink is not ejected from other nozzles! /.
- ink is dropped once (one drop) at every spacer forming position.
- the nozzle ridges indicate nozzles that perform ink ejection
- the circles indicate nozzles that do not perform ink ejection.
- the wrinkles on the substrate 1 represent the spacer formation positions, and each spacer formation position receives one drop of ink as described above. As a result, it is possible to prevent the portion where the spacer is not formed from being formed in a line shape corresponding to the abnormal nozzle position, and to stably hold the desired liquid crystal sealing gap.
- Figure 6 ⁇ indicates a normal nozzle and ⁇ indicates an abnormal nozzle.
- the numbers on the substrate 1 indicate how many times (how many drops) of ink has been applied to each spacer formation position.
- FIG. 6 when two nozzles No. 8 and No. 17 out of 32 nozzles are abnormal discharge nozzles, first, the ink from the nozzles No. 8 and No. 17 is removed. Without discharging, only ink is discharged from the normal nozzles No. 6 to 7, 9 to 16, and 18 to 32 to the substrate 1.
- nozzles Nos. 6-7, 9-16, 18-32 while the substrate 1 is moved in the direction indicated by the arrow (direction orthogonal to the nozzle parallel direction) with respect to the stationary inkjet head 3.
- Normal nozzle force of ink is ejected and dripped onto the spacer formation position on the substrate 1.
- the ink and the spacers contained in the spacer are not dripped at the third and twelfth row spacer formation positions corresponding to the abnormal nozzles. It is.
- the inkjet head 3 is moved to the right by 5 nozzles in FIG. 6, and the spacer formation position corresponding to the abnormal nozzle is shifted from the first time.
- the second ink discharge is performed on the substrate 1 in the same manner as the first time.
- only normal nozzles Nozzle Nos. L-7, 9-16, and 18-27 should be ejected and ink should not be ejected from other nozzles! /.
- the ink was dropped twice (two drops of ink was dropped) at the spacer formation position corresponding to the normal nozzle during both the first and second ejections, One drop (one drop of ink is dropped) at the spacer formation position where either of the second time corresponds to the abnormal nozzle. There is no spacer formation position that corresponds to the abnormal nozzle in both the first time and the second time, so the spacer is not formed! The part is formed in a line corresponding to the abnormal nozzle position The liquid crystal sealing gap can be stably held.
- the amount of ink necessary to form the desired number of spacers is dropped all at once (in one drop). Rather than being dropped into two drops, the drop amount per drop can be reduced, and the spread of the dropped ink can be suppressed by that amount, and the spacer is kept within a predetermined range (black It can be formed so as to fit securely in the matrix 5 area. As a result, it is possible to prevent a spacer from being formed in each RGB pixel which is a light transmission part contributing to display, and to prevent deterioration in display image quality. [0071] About 3 to 7 spacers are preferably formed in a certain range per one spacer formation position.
- the number of spacers per drop varies depending on the density of the spacer in the ink, the droplet size, etc., but if there is only one drop, it does not contain any spacers or the desired number is included. Therefore, from the viewpoint of preventing this, it is preferable to drop a plurality of drops of ink at one spacer forming position.
- the inkjet head 3 is moved to the right by three nozzles in FIG. 7, and the spacer formation position corresponding to the abnormal nozzle is shifted from the first time.
- the second ink discharge is performed on the substrate 1 in the same manner as the first time.
- only normal nozzles Nozzle Nos. 4 to 7, 9 to 16, and 18 to 29 are allowed to eject ink, and ink is not ejected from other nozzles! /.
- the inkjet head 3 is moved from the second time to the right by three nozzles in FIG. 7, and the spacer formation position corresponding to the abnormal nozzle is shifted from the first time and the second time.
- the third ink discharge is performed on the substrate 1 in the same manner as the first and second times.
- ink is ejected only from normal nozzles Nos. 1 to 7, 9 to 16, and 18 to 26, and ink is not ejected from other nozzles.
- ink was dropped three times (three drops of ink was dropped) at the spacer formation position corresponding to the normal nozzle at the first to third discharges, and 1-3.
- Two drops of ink were applied to the spacer formation position where one of the second time corresponded to the abnormal nozzle. (2 drops of ink are applied).
- the discharge is performed a plurality of times while shifting the corresponding position between the abnormal nozzle and the spacer formation position, the portion is formed in a line corresponding to the abnormal nozzle position without forming the spacer. It is possible to prevent the liquid crystal from being formed and to stably hold the desired liquid crystal sealing gap.
- the spacer formation positions receive a plurality of ink drops, the spread of the dropped ink can be suppressed, and the spacers are within a predetermined range (in the area of the black matrix 5). It can be formed so as to fit securely. Furthermore, the probability that the spacer number power ⁇ or the desired number is not reached can be reduced.
- the inkjet head 3 is moved to the right by three nozzles in Fig. 8 to shift the spacer formation position corresponding to the abnormal nozzle from the first time.
- the second ink discharge is performed on the substrate 1 in the same manner as the first time.
- only normal nozzles Nozzle Nos. 4 to 7, 9 to 16, and 18 to 29 are allowed to eject ink, and ink is not ejected from other nozzles! /.
- the inkjet head 3 is moved from the second time by three nozzles to the right in FIG. 8, and the spacer formation position corresponding to the abnormal nozzle is shifted from the first time and the second time.
- the third ink discharge is performed on the substrate 1 in the same manner as the first and second times.
- nozzle No. 2, 5, 11, 14 Make sure that only normal nozzles eject ink, and not eject ink from other nozzles! /.
- the number of ink drops can be made equal to 2 at all the spacer formation positions, and the dispersion of the spacer number distribution in the substrate surface can be suppressed. As a result, a more stable liquid crystal sealing gap can be secured.
- the spacer formation positions receive a plurality of ink drops, the spread of the dropped ink can be suppressed, and the spacers are kept within a predetermined range. It can be formed so as to be surely contained within (in the region of the black matrix 5). In addition, the probability is reduced if the number of spacers is 0 or less than the desired number.
- FIG. 9 is a block diagram showing a configuration of the spacer forming apparatus according to the present embodiment.
- the spacer forming apparatus includes an inkjet head 3 having a plurality of nozzles arranged in a line (see FIG. 2), a head moving means 17 for moving the inkjet head 3, a substrate moving means 18, and a discharge observing means. 19, a cleaning means 20, a storage device 14, a display device 15, and a processing device 10 to which these are connected.
- the head moving means 17 uses, for example, a step motor or a piezoelectric motor as a drive source, and moves the inkjet head 3 in a direction parallel to the nozzle parallel direction.
- the substrate moving means 18 moves the stage that supports the substrate 1 in a direction (scanning direction) orthogonal to the nozzle parallel direction.
- the ejection observation means 19 is a laser optical system, a camera, an image processing apparatus, or the like that observes the state of ink ejection from the nozzles.
- the storage device 14 is, for example, a semiconductor memory or a magnetic disk that stores abnormal nozzle positions.
- the processing apparatus 10 includes a control unit 11 and a calculation unit (discharge pattern creation unit 12 and discharge abnormality determination unit 13).
- an XY stage that can move in two orthogonal directions can be used as the substrate moving means 18.
- an XY stage that can move in two orthogonal directions can be used as the head moving means 17 with the substrate fixed.
- step S1 the flow is started in step S1, and trial discharge is performed in the next step S2.
- This trial discharge is observed by the discharge observation means 19 (step S3).
- This observation data discharge speed, discharge angle, etc.
- the discharge abnormality determination unit 13 of the processing device 10 determines discharge abnormality based on the observation data.
- step S4 If the result of this determination is that there are no ejection abnormal nozzles, "NO" is determined in step S4, and ink is ejected from all nozzles corresponding to the spacer formation positions in each row. (Step S13), the flow ends (Step S17). Each spacer formation position may be ejected by a single drop or a plurality of drops.
- step S4 If there is a nozzle with an abnormal discharge, “YES” is determined in step S4, and in the next step S5, it is determined whether or not the number of abnormal nozzles is less than the allowable value. If the number of abnormal nozzles is too large, “NO” is displayed in step S5, an error is displayed on the display device 15 (step S14), and the cleaning mode is selected automatically or manually (step S15). The nozzle 20 is cleaned by the cleaning means 20 (step S16).
- step S5 If the number of abnormal nozzles is less than or equal to the allowable value, “YES” is determined in step S5, and the position of the abnormal nozzle is stored in the storage device 14 (step S6).
- nozzles No. 8 and No. 17 are stored as abnormal nozzles.
- the discharge pattern creating unit 12 Based on the abnormal nozzle position and various set values (number of scans, target number of times of discharge, minimum number of times of discharge, minimum interval of discharge lines), the discharge pattern creating unit 12 creates a discharge pattern (step S7). . Examples of discharge patterns are shown in FIGS.
- the number of scans is the number of times the inkjet head and the substrate are relatively moved in a direction orthogonal to the nozzle parallel direction.
- the target number of times of ejection is the target number of times (number of drops) of ink to be dropped at one spacer formation position.
- the minimum number of ejections indicates the number of ink drops that are desired to be secured at least for the spacer formation position that cannot receive the target number of ink drops due to the presence of abnormal nozzles.
- the interval between the minimum discharge lines indicates how much space is to be secured between the rows (lines) of the spacer formation positions that have received the number of drops not reaching the target number of discharges, and is 0 when adjacent.
- the number of times that does not reach the target number of discharges You may set the number of rows (lines) of the spacer formation position that received the dripping as the set value.
- ⁇ indicates a normal nozzle that does not discharge ink
- ⁇ indicates a normal nozzle that discharges ink
- ⁇ indicates an abnormal nozzle that does not discharge ink.
- the spacer formation position on the substrate is shown for one line along the nozzle parallel direction along with the number of ink drops.
- step S7 It is determined in steps S8 to S11 whether or not the discharge pattern created in step S7 satisfies the above set value condition. If the conditions of each set value are not satisfied in steps S8 to S10, the discharge pattern is recreated in step S7. If the scan number setting condition cannot be satisfied, the increase in the number of scans will lead to poor production efficiency, so “NO” is displayed in step S11 and an error is displayed on the display device 15 (step S14). Then, the cleaning mode is selected automatically or manually (step S15), and the nozzle is cleaned by the cleaning means 20 (step S16).
- step S7 When the ejection pattern created in step S7 satisfies all the conditions of step S8 to step SI 1, how the control unit 11 moves the inkjet head 3 and the substrate based on the ejection pattern.
- the nozzles are controlled to control the nozzles from which ink is ejected, and ink is dropped onto the spacer forming position on the substrate (step S12), and the flow ends (step S17).
- the example of the ejection pattern in FIG. 11 is an example of an ejection pattern in which the number of columns where one drop of ink is not dropped is minimized and the interval between the columns is maximized.
- the discharge pattern example in FIG. 12 is an example of a discharge pattern in which priority is given to reducing the number of rows rather than increasing the interval between rows in which one drop of ink is not dropped.
- the ejection pattern in Fig. 13 is the second and subsequent inkjet head movement amount (nozzle position shift amount) and the ejection pattern example in Fig. 14 in which the selection of the ejection nozzle is changed. Fulfill.
- the discharge pattern example of FIG. 15 is the second and subsequent ink jet head movement amount (nozzle position shift amount) and the discharge pattern example in Fig. 16 in which the selection of the discharge nozzle is changed.
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Description
Claims
Priority Applications (3)
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KR1020067014375A KR100789287B1 (ko) | 2004-10-19 | 2005-10-18 | 스페이서 형성방법 및 스페이서 형성장치 |
US10/586,064 US7671962B2 (en) | 2004-10-19 | 2005-10-18 | Spacer forming method and spacer forming apparatus |
JP2006520443A JP4771426B2 (ja) | 2004-10-19 | 2005-10-18 | スペーサ形成方法及びスペーサ形成装置 |
Applications Claiming Priority (4)
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JP2004-303701 | 2004-10-19 | ||
JP2004303701 | 2004-10-19 | ||
JP2005-087199 | 2005-03-24 | ||
JP2005087199 | 2005-03-24 |
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WO2006043545A1 true WO2006043545A1 (ja) | 2006-04-27 |
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PCT/JP2005/019114 WO2006043545A1 (ja) | 2004-10-19 | 2005-10-18 | スペーサ形成方法及びスペーサ形成装置 |
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US (1) | US7671962B2 (ja) |
JP (1) | JP4771426B2 (ja) |
KR (1) | KR100789287B1 (ja) |
TW (1) | TWI388906B (ja) |
WO (1) | WO2006043545A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008008941A (ja) * | 2006-06-27 | 2008-01-17 | Konica Minolta Holdings Inc | インクジェット記録装置及びインクジェット記録方法 |
JP2011147861A (ja) * | 2010-01-20 | 2011-08-04 | Ulvac Japan Ltd | スペーサ塗布装置及びスペーサ塗布方法 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7671962B2 (en) * | 2004-10-19 | 2010-03-02 | Ulvac, Inc. | Spacer forming method and spacer forming apparatus |
JP5464638B2 (ja) * | 2008-08-05 | 2014-04-09 | 株式会社ジャパンディスプレイ | 表示素子 |
CN104765202B (zh) * | 2015-04-24 | 2018-09-11 | 合肥京东方光电科技有限公司 | 液晶显示面板及其制造方法、液晶显示装置 |
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- 2005-10-18 US US10/586,064 patent/US7671962B2/en active Active
- 2005-10-18 JP JP2006520443A patent/JP4771426B2/ja not_active Expired - Fee Related
- 2005-10-18 WO PCT/JP2005/019114 patent/WO2006043545A1/ja active Application Filing
- 2005-10-18 KR KR1020067014375A patent/KR100789287B1/ko active IP Right Grant
- 2005-10-19 TW TW094136459A patent/TWI388906B/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
KR20070034982A (ko) | 2007-03-29 |
TW200617542A (en) | 2006-06-01 |
KR100789287B1 (ko) | 2007-12-28 |
US7671962B2 (en) | 2010-03-02 |
JPWO2006043545A1 (ja) | 2008-05-22 |
TWI388906B (zh) | 2013-03-11 |
JP4771426B2 (ja) | 2011-09-14 |
US20070285609A1 (en) | 2007-12-13 |
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