JP2003021714A - Manufacruting method for filter, and filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for filter wherein the productivity can be enhanced by scanning a substrate once with a recoding head to form a plurality of pixels nearly free from unevenness at a high speed on the substrate and to provide a filter. SOLUTION: In the manufacturing method for filter wherein the filter is formed by ejecting ink drops from a plurality of nozzles several times respectively to the substrate by using the recording head provided with the plurality of nozzles for ejecting the ink drops to respectively form the plurality of pixels on the substrate, the quantity of liquid drops of the ink drops ejected from the respective nozzles can be set for every ejection timing of the plurality of nozzles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording head having a plurality of nozzles for ejecting ink droplets, and ejecting ink droplets from the plurality of nozzles onto the substrate a plurality of times to form a plurality of pixels on the substrate. The present invention relates to a filter manufacturing method for manufacturing a filter by forming the filter and a filter manufactured by this method.

[0002]

2. Description of the Related Art With the recent development of the information industry, there is an increasing demand for liquid crystal displays as display devices used in information terminals, mobile phones and the like. For example, recent liquid crystal displays for mobile phones are becoming more and more colorized, and the demand for color filters for liquid crystal displays has increased significantly.
There is an increasing demand for supplying large quantities of color filters cheaply. In order to meet this demand, a recording head adopting a conventionally used ink jet method ejects ink droplets onto a substrate to be a color filter,
A technique of forming a pixel composed of the ink droplet on the substrate is used. The method of manufacturing a color filter in which pixels are formed on a substrate by using the inkjet method has a feature of being inexpensive.

Further, as a specific example of a method of manufacturing a color filter, for example, ink droplets of colors corresponding to the three primary colors of R (red), G (green) and B (blue) light are formed in predetermined patterns. By landing on the substrate, pixels formed by the ink droplets are formed. In such a method of manufacturing a color filter using an inkjet recording head, an error may occur in the amount of ink droplets ejected due to an error in the shape of a plurality of nozzles or the like. Therefore, when a color filter is manufactured by ejecting ink droplets onto a substrate by such an ink jet recording head, a dispersion method is used in order to compensate for an error in the amount of ink droplets ejected from each nozzle. Has been adopted. This distribution method is 1
In this method, one pixel is formed by ejecting an ink droplet from each of a plurality of different nozzles in the recording head.

[0004]

However, in the color filter manufacturing method employing such a dispersion method, since the same pixel is formed by overlapping a plurality of ink droplets ejected from a plurality of different nozzles, The recording head needs to scan the substrate by the number of times the ink drops are overlapped. In other words, such a color filter manufacturing method requires a cycle time for the number of times the print head scans,
There was a problem that productivity did not rise.

Further, in the method of manufacturing a color filter of the dispersion type, the ink droplets that have landed first may start to dry by the time when the ink droplets land last. Therefore, there is a possibility that color unevenness may occur in a plurality of pixels formed on the substrate.

An object of the present invention is to solve the above problems and to improve productivity by forming a plurality of pixels on a substrate at a high speed with less unevenness by scanning the substrate once by the recording head. A filter manufacturing method and a filter are provided.

[0007]

According to a first aspect of the present invention, a recording head having a plurality of nozzles for ejecting ink droplets ejects the ink droplets from the plurality of nozzles to a substrate a plurality of times. A filter manufacturing method for manufacturing a filter by respectively forming a plurality of pixels on the substrate, wherein a droplet amount of the ink droplets discharged from the plurality of nozzles is determined at each discharge timing of the plurality of nozzles. It is a method of manufacturing a filter characterized by being settable.

According to the first aspect of the present invention, the amount of ink droplets ejected from the plurality of nozzles can be set for each ejection timing of the plurality of nozzles. A quantity of ink droplets can be ejected. Therefore, it is possible to control the total droplet amount of the ink droplets ejected from each nozzle and land on the substrate, and the total droplet amount of each pixel formed on the substrate can be made substantially the same. Each pixel is formed substantially the same without unevenness.

Further, since the recording head scans the substrate once, the total amount of droplets of each pixel formed on the substrate can be made substantially the same, so that a plurality of pixels with less unevenness can be formed at high speed. Therefore, the productivity of filter manufacturing can be improved. Therefore, according to such a filter manufacturing method, it is possible to manufacture at high speed a filter having less pixel unevenness and good image quality.

According to a second aspect of the present invention, in the structure of the first aspect, the total droplet amount of the plurality of ink droplets ejected to each of the plurality of pixels is substantially constant in each of the pixels. It is characterized in that

According to a third aspect of the present invention, in the structure of the first or second aspect, the droplet amount set for each of the ejection timings is a plurality of different driving prepared in advance for driving the plurality of nozzles. It is characterized by being set by selecting from the waveform.

According to the third aspect of the invention, by selecting from a plurality of different drive waveforms prepared in advance for driving a plurality of nozzles, the droplet amount set at each ejection timing is set. Therefore, it is possible to easily and accurately set the ink droplet amount.

According to a fourth aspect of the present invention, in the configuration of the third aspect, the plurality of nozzles have different timings for each same drive waveform selected for each nozzle from the plurality of drive waveforms prepared in advance. It is characterized by being driven by.

According to the structure of the fourth aspect, it is possible to control the amount of ink drops with a simple circuit structure.

According to a fifth aspect of the present invention, in the configuration of the third aspect, the plurality of nozzles are driven at the same timing by a drive waveform selected for each nozzle from the plurality of drive waveforms prepared in advance. It is characterized by being done.

According to the structure of claim 5, the plurality of nozzles are driven at the same timing by the drive waveform selected for each nozzle from the plurality of drive waveforms prepared in advance. The time interval for ejecting ink droplets can be shortened, and the productivity of filter manufacture can be further improved.

According to a sixth aspect of the present invention, a recording head having a plurality of nozzles for ejecting ink droplets ejects the ink droplets from the plurality of nozzles onto the substrate a plurality of times to form a plurality of pixels on the substrate. A method of manufacturing a filter, wherein a filter is manufactured by forming each of a plurality of nozzles, a measuring step of measuring a droplet amount of an ink droplet ejected from each of the plurality of nozzles of the recording head, and forming each of the pixels. A selection step of selecting a drive waveform of the nozzle that drives each of the nozzles a plurality of times from a plurality of different drive waveforms of the nozzle prepared in advance, so that the total droplet amount of the ink droplets becomes substantially constant. , Each of the nozzles of the recording head is driven a plurality of times based on the selected drive waveform of the nozzle, and each of the nozzles drives the nozzle. A pixel-forming step of forming the serial pixel, respectively, is a method for producing a filter, comprising a.

According to the sixth aspect of the invention, first, in the measuring step, the amount of ink droplets ejected from each of the plurality of nozzles of the recording head is measured. Next, in the selection step, the drive waveforms of the nozzles that drive each nozzle a plurality of times are selected from the drive waveforms of the different nozzles that are prepared in advance so that the total droplet amount of the ink droplets that form each pixel becomes appropriate. select. Finally, in the pixel forming step, each nozzle of the recording head is driven a plurality of times based on the drive waveform of the selected nozzle, and each nozzle forms one pixel.

With this arrangement, the total amount of ink droplets ejected from the nozzles of the recording head for forming each pixel and landing on the substrate becomes approximately the same amount, and is formed on the substrate. The pixels to be processed are substantially the same. Therefore, in a filter manufactured by forming such pixels on a substrate, each pixel is formed substantially the same without unevenness. Therefore, according to such a method of manufacturing a filter, it is possible to manufacture a filter with less pixel unevenness and good image quality.

According to a seventh aspect of the present invention, in the configuration of the sixth aspect, the nozzle is driven at different timings for each of the drive waveforms of the plurality of different nozzles prepared in advance in the pixel forming step. To do.

According to the seventh aspect of the invention, it is possible to control the amount of ink droplets with a simple circuit configuration.

According to an eighth aspect of the present invention, in the configuration of the sixth aspect, in the pixel forming step, the nozzles are driven at the same timing based on the drive waveforms of the plurality of different nozzles prepared in advance. Characterized by

According to the structure of claim 8, the plurality of nozzles are driven at the same timing based on the drive waveforms of a plurality of different nozzles prepared in advance.
The time interval for ejecting ink droplets can be shortened, and the productivity of filter manufacture can be further improved.

According to a ninth aspect of the present invention, in any one of the sixth to eighth aspects, the driving waveforms of the plurality of different nozzles are about 110% of the standard driving voltage of the nozzles. A first drive waveform of the drive voltage, a second drive waveform of the standard drive voltage of the nozzle, and a third drive waveform of a drive voltage of approximately 90% of the standard drive voltage of the nozzle. , Are prepared in advance.

According to the structure of the ninth aspect, in addition to the operation of any of the sixth to eighth aspects, the first drive waveform, the second drive waveform and the third drive waveform as described above are provided. One of them is selected for each ejection of each ink droplet, and each nozzle is driven a plurality of times based on the selected drive waveform to eject the ink droplet onto the substrate. Then, the total amount of ink droplets forming the pixels formed on the substrate is 1.25 to 2.5%.
The target total droplet amount can be obtained with a margin of error. Therefore, according to such a filter manufacturing method,
Since the total droplet amount of the ink droplets forming the pixel can be made accurate, a desired pixel can be formed on the substrate.

According to a tenth aspect of the present invention, in any one of the sixth to ninth aspects, the substrate is provided with a receiving layer for accommodating the ink droplets ejected from each of the nozzles a plurality of times. It is characterized by being

According to an eleventh aspect of the present invention, in the configuration according to any one of the sixth to tenth aspects, the recording head is
The ink droplets are ejected onto the substrate while scanning relative to the substrate.

According to a twelfth aspect of the present invention, a recording head having a plurality of nozzles for ejecting ink droplets ejects the ink droplets from the plurality of nozzles onto the substrate a plurality of times, thereby forming a plurality of pixels on the substrate. A filter manufactured by forming the plurality of nozzles, wherein the droplet amount of the ink droplets ejected from the plurality of nozzles is set for each ejection timing of the plurality of nozzles, and the plurality of nozzles are set based on the setting. A filter manufactured by ejecting ink droplets from a nozzle.

According to the structure of the twelfth aspect, the filter sets the droplet amounts of the ink droplets ejected from the plurality of nozzles for each ejection timing of the plurality of nozzles, and based on this setting, the plurality of nozzles are ejected. Since it is manufactured by ejecting ink droplets, it is possible to control the total amount of ink droplets ejected from each nozzle and landing on the substrate.
Since the total amount of droplets of each pixel formed on the substrate can be made substantially the same, the pixels can be formed substantially the same without unevenness.

Further, since the recording head scans the substrate once, the total liquid droplet amount of each pixel formed on the substrate can be made substantially the same, so that a plurality of pixels with less unevenness can be formed at high speed. Therefore, the productivity of filter manufacturing can be improved. Therefore, it is possible to provide a filter having high productivity and less pixel unevenness and good image quality.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a configuration example of a substrate 13 on which the filters 11 are arranged, and FIG.
It is a top view which shows the structural example of a part of filter 11 manufactured from the board | substrate 13 of FIG.

The substrate 13 is a base material of the filter 11 described later, and one side in the longitudinal direction is, for example, 470 mm, and the other side is, for example, 370 mm. The substrate 13 is
A transparent substrate having a suitable mechanical strength and high light transmittance is used. As the substrate 13, for example, a transparent glass substrate, an acrylic glass, a plastic substrate, a plastic film, a surface-treated product thereof, or the like can be applied.

The filter 11 has, for example, at least 1
Pixels of different colors, preferably multiple colors, are formed. That is, the filter 11 is, for example, a color filter in which pixels of a plurality of colors are formed. In the following description, the filter 11
Is called a color filter 11. As shown in FIG. 2, for example, a red pixel PR, a blue pixel PB, and a green pixel PG are formed in the color filter 11. In the following description, these pixels PR, PB and PG are also collectively referred to as a pixel P.

The color filter 11 is a filter used for a liquid crystal display as a display device, for example, and is a delta type in which pixels PR, PB and PG are arranged in a delta shape, for example. In addition, the color filter 11 includes the pixel P.
It goes without saying that R, PB and PG may be arranged in a stripe type or a mosaic type. The delta type color filter 11 is called in this way because all the pixels PR, PB and PG formed on the surface of the substrate 13 are arranged in a delta shape.
A liquid crystal display (not shown) that uses the delta type color filter 11 is generally suitable for displaying a moving image.

FIG. 3 is a plan view showing an example of how the color filter 11 is manufactured by the filter manufacturing method according to the preferred embodiment of the present invention. The page in Figure 3 is
The substrate 13 is shown, and the head 7 is provided at a slight distance from the substrate 13 in the direction perpendicular to the plane of the drawing. The head 7 (recording head) has, for example, 180 nozzles N1 to N that eject ink droplets on the surface facing the substrate 13.
180 (91) is provided. In the following description, as an example, the print head 7 has 180 nozzles N1 to N18.
The description will be made assuming that 0 is provided.

Therefore, the head 7 is a recording head adopting the so-called ink jet system. Further, the head 7 can scan the substrate 13 relatively in the head scanning direction HD. Therefore, this head 7
Can eject ink droplets onto the substrate 13 while relatively scanning the substrate 13 in the head scanning direction HD, and form pixels PR formed of the ink droplets on the substrate 13.

The recording head 7 has a pixel array direction GH.
The pixel PB and the pixel PG can be formed on the substrate 13 similarly to the pixel PR.

The structural example of the color filter 11 is as described above. Next, a structural example of the manufacturing apparatus 2000 using the manufacturing method of the color filter 11 will be described with reference to FIGS.

FIG. 4 shows a configuration example of the manufacturing apparatus 2000. The computer 34 is a control panel 8 on the base 12 side.
It is connected to 0. The control board 80 is disposed in the base 12, and the first moving means 14 (linear motor), the second moving means 16 (linear motor), and the θ-axis motor 44 are connected to the control board 80. Has been done. Also,
Motors 62, 64, 6 related to the movement of the recording head 7
6, 68 are connected to the control panel 80. The first moving means 14 and the θ-axis motor 44 operate in response to a command from the control panel 80 to move the table 46 on which the color filter manufacturing substrate 13 is mounted in the Y-axis direction relative to the recording head 7. And index in the θ direction.

The second moving means 16 and the four motors 62,
64, 66, 68 are operated by a command from the control panel 80 to move the recording head 7 to the substrate 1 on the table 46, for example.
The attitude is controlled or moved with respect to 3. Further, the operation of the robot 74, which is a substrate feeding / discharging means, can be controlled by a command from the computer 34.

Next, an example of the structure of the recording head 7 will be described with reference to FIGS. The recording head 7 is, for example, a head using a piezoelectric element (piezoelectric element), and a plurality of nozzles 91 are formed on the ink ejection surface 20P of the main body 90 as shown in FIG. 5A. A piezo element PZT is provided for each of these nozzles 91.

As shown in FIG. 5B, the piezo element PZT
Are arranged corresponding to the nozzles 91 and the ink chambers 93. And, for this piezo element PZT, FIG.
The applied voltage Vh is applied as shown in FIG.
As shown in (E) and FIG. 5 (F), the piezo element P
By expanding and contracting ZT in the direction of arrow Q, the ink is pressurized to eject a predetermined amount of ink droplets from the nozzle 91.

The recording head 7 shown in FIG.
The ink is supplied from the ink supply section 97 to the ink chamber 93 of FIG. 5B. A thermometer 96 and a viscometer 95 are connected to the ink supply unit 97.
The thermometer 96 and the viscometer 95 measure the temperature and viscosity of the ink contained in the ink supply unit 97, and supply them to the ink management controller 98 as feedback signals S1 and S2 of the state of the ink.

The ink management controller 98 gives the state of the temperature and viscosity of the ink as control information to the computer 34 based on the feedback signals S1 and S2 of the state of the ink. The computer 34 is a control panel 8
Through 0, the piezo element drive signal S3 is sent to the piezo element drive circuit 101. Piezo element drive circuit 101
On the basis of this piezo element drive signal S3.
By supplying the applied voltage Vh according to the temperature and viscosity of the ink at that time to the piezo element PZT of (B), a predetermined amount of ink droplets can be ejected from the nozzle 91 according to the temperature and viscosity of the ink. it can.

FIG. 6 shows the piezoelectric element drive circuit 101 of FIG.
7 is a circuit diagram showing an example of the electrical configuration of FIG. 7, and FIG. 7 is a circuit diagram showing an example of the electrical configuration of the logic 27 of FIG. The piezo element drive circuit 101 has a drive waveform generation circuit 15, a piezo element PZT, an analog switch driver 29, a logic 27, an upper latch 23, a lower latch 25, an upper shift register 19 and a lower shift register 21.

A predetermined latch signal LATCH is input to the drive waveform generation circuit 15. This latch signal LAT
CH latches gate signals SIH and SIL, which will be described later, for selecting whether or not to drive the piezo element PZT corresponding to, for example, 180 nozzles of the recording head 7.
And a trigger signal for applying the drive waveform COM to the piezo element PZT. In addition, the drive waveform generation circuit 15
Shows the drive waveform COM as the analog switch driver 2
9 and the first selection signals V1 to V3 indicating a part of the drive waveform COM are output to the logic 27, respectively.

The upper shift register 19 is synchronized with the clock signal SCLK, for example, 180
A 180-bit second selection signal SIH for selecting whether or not to drive the piezo element PZT connected to each nozzle is input. On the other hand, the lower shift register 21 is provided with 18 for selecting whether or not to drive the piezo elements PZT connected to, for example, 180 nozzles in synchronization with the clock signal SCLK.
The 0-bit third selection signal SIL is input.

The upper latch 23 and the lower latch 25 each have a function of recording at least 180-bit data. These upper latch 23 and lower latch 25
The latch signal LATCH is input to each. The upper latch 23 can latch the second selection signal SIH from the upper shift register 19 as the second selection signal SH in synchronization with the latch signal LATCH. On the other hand, the lower latch 25 receives the latch signal LAT.
The third selection signal SIL from the lower shift register 21 can be latched as the third selection signal SL in synchronization with CH.

Further, the logic 27 acquires the second selection signal SH of the upper latch 23 as the second selection signal DH at a predetermined timing, and at the same time, outputs the third selection signal SL of the lower latch 25 to the third selection signal SL. It is acquired as the selection signal DL. The logic 27 has a structure as shown in FIG. 7 per one piezo element PZT out of 180 logic elements. In other words, the logic 27 of FIG. 7 has one piezo element PZT.
To the first selection signals V1 to V composed of 3 bits
3, a function of selecting whether or not to drive the second selection signal DH of 1 bit each and the third selection signal DL of 1 bit each as a gate signal of the analog switch driver 29 by applying the drive waveform COM. Have. Therefore, for example, 180 piezo elements PZT are appropriately driven by the selection signals DH and DL of at least 360 bits in total, for example.

8 (A) to 8 (B) are respectively shown in FIG.
It is a figure which shows the operation example of the logic 27 of FIG. FIG. 8 (A)
Is the first drive waveform CO as the drive waveform COM in FIG.
An example of the ink droplets I1 to I3 formed on the substrate 13 by the M1 to third drive waveforms COM3 is shown.
It can be seen that the size of the ink drops I1 to I3 is determined by the size of the drive voltage.

In this embodiment, as an example, the first drive waveform COM1 is different from the second drive waveform COM2 of the standard drive voltage of the nozzle in which the ink droplet has the optimum weight.
For example, 110% (+
The drive voltage is set to 10%), and the third drive waveform COM3 is set to, for example, 90% (-10%) of the standard drive voltage of the nozzle. Therefore, the first drive waveform COM1 changes to the second drive waveform COM.
It is possible to form the ink droplet I1 having a larger diameter than the ink droplet I2 formed by 2. Further, the third drive waveform COM3 can form an ink drop I3 having a smaller diameter than the ink drop I2 formed by the second drive waveform COM2.

In addition, the ink droplet I is ejected from the nozzle of the recording head.
One condition for ejecting 1 onto the substrate 13 is, for example, as shown in FIG. 8B, first selection signals V1 to V3.
Are “0”, “0” and “1” respectively, and the second
Selection signal DH is “1” and the third selection signal DL is “1”.

That is, the gate of the analog switch driver 29 is opened / closed by the 3-input 1-output NOR circuit 28 shown in FIG. 7 according to the combination of the first selection signals V1 to V3 and the second and third selection signals DH and DL. Then, the selected drive waveform COM is applied to the piezo element PZT.

Next, the drive waveform COM will be described.
FIG. 9 is a diagram showing an example of the drive waveform COM of FIG.
FIG. 10A is a diagram showing an example of the weight of ink droplets and the like when the drive voltage V of FIG. 9 is changed.
FIG. 10B is a diagram showing an example of the weight of the ink droplet with respect to the drive voltage V of FIG. Here, FIG. 10 (A)
In the atmosphere at a temperature of 22.9 ° C., ink droplets of 50,000 shots are landed on the substrate 13 and the green pixel PG is printed on the substrate 1.
3 illustrates the case of being formed.

As shown in FIG. 9, as the drive waveforms of the drive waveform COM, the first drive waveform COM1, the second drive waveform COM2, and the third drive waveform COM3 are illustrated. The drive waveform is not limited to three types. First
The drive waveform COM1 of is the maximum voltage Vhmax,
The drive waveform COM2 of is the maximum voltage Vh, and the third drive waveform COM3 is the maximum voltage Vhmin. Here, the second drive waveform COM2 is set to be a drive waveform of a standard drive voltage. Therefore, as described above, the first drive waveform COM1 is driven at a voltage higher than the standard drive waveform, and the third drive waveform COM3 is driven at a voltage lower than the standard drive waveform. Become. The first drive waveform COM1 is selected when the ink droplet volume is less than the standard ink droplet volume. On the other hand, the third drive waveform COM3 is selected when the amount of ink droplets is larger than the standard amount of ink droplets.

Referring to FIG. 10A, it can be seen that the weight of the ejected ink droplet changes as the driving voltage V changes. This characteristic is illustrated in FIG. 10 (B). The weight of the ink droplet ejected from the nozzle is almost proportional to the drive voltage V.

Therefore, the ink droplets landing on the substrate 13 by selecting each driving waveform can select any one of the driving waveforms shown in FIG. Are as shown in the ejection drop I1 when the first drive waveform COM1 is selected to the ejection drop I3 when the third drive waveform COM3 is selected. In this description, as an example, one pixel is formed by ejecting eight ink droplets onto the substrate 13 at the first ejection timing Ti1 to the eighth ejection timing Ti8.

Next, an example of a method of manufacturing a filter will be described with reference to FIGS. FIG. 12 is a flowchart showing an example of a filter manufacturing method.

Measuring Step First, in step ST1, the weight (droplet amount) of ink droplets ejected from all the nozzles N1 to N180 of the recording head 7 of FIG. 3 is measured. FIG. 13 shows an example of measured values of the weight of ink droplets ejected from each nozzle. As shown in FIG. 13, the ejection weight of the ink droplet is
There is often a variation of about 20% with respect to the average value, and the ejection amount tends to increase particularly at both ends of the nozzle.

Selection Step Next, in the selection step, the drive waveforms of the nozzles that drive each of the nozzles N1 to N180 a plurality of times so that the total droplet amount of the ink droplets forming each pixel P becomes substantially constant. Is selected from the drive waveforms of a plurality of different nozzles prepared in advance. Specifically, in step ST2 of FIG. 12, an average value is obtained from the measured weights of the ink droplets ejected from all the nozzles N1 to N18.

Further, in step ST2, the drive voltage Vh of FIG. 9 for ejecting the ink droplet of the average amount of the weight of the ink droplet is obtained, and the second drive waveform COM2 is set. Then, in step ST2, the first drive waveform COM1 and the third drive waveform COM3 are set in consideration of the second drive waveform COM2 of FIG. Then, in step ST2, for example, the first drive waveform COM1 to the third drive waveform COM3 are changed from the first drive waveform COM1 to the third drive waveform COM3 in FIG. Combine as shown in.

Therefore, the total of the eight ink drops in one nozzle of the recording head 7 is 108.9 to 110.0%.
In the case of, for example, the first to seventh drops are -10% each.
(3rd drive waveform COM3), each drive waveform is combined so that the 8th drop becomes a standard (2nd drive waveform COM2). By doing so, the weight (scheduled adjustment amount) of the eight ink droplets ejected from this nozzle of the recording head 7 is 9
It becomes 1.3%. Therefore, the recording head 7 is selected 8
By overlapping the ink droplets, it is possible to set the planned adjustment amount as the target amount of the total ink droplet amount in units of about 1.25 to 2.5%.

Then, as shown in FIG. 15, all the nozzles N1 to N180 of the recording head 7 of FIG. 3 are not corrected and the amount of ink droplets actually ejected (measured weight) is corrected. Corrected to be stable at 7.6 ng as shown by weight.

Pixel Forming Step In the pixel forming step, each nozzle is driven a plurality of times based on the drive waveform of the selected nozzle, and each pixel is formed by each nozzle. Specifically, FIG.
This will be described with reference to FIG.

16A to 16D and FIG.
17A to 17D show color filters 11 respectively.
FIG. 6 is a cross-sectional view showing an example of the manufacturing process of. In the following description, as an example, an example will be described in which pixels are formed on the substrate 13 by ink droplets from the nozzle N1 of the recording head 7.

As shown in FIG. 16A, the receiving layer 31 is formed on the substrate 13 by the bank 39 and the like. The recording head 7 moves in the head scanning direction HD relative to the substrate 13 and is set in the receiving layer 31 as described above, for example, as shown in FIGS. 16A to 16D. Eject 8 ink drops. The ink droplet I that has landed on the substrate 13 is contained in the receiving layer 31 with a slightly bulged central portion as shown in FIG. The ink droplet I is dried in a drying process, for example, as shown in FIG. 17A, and has a substantially constant thickness. And the substrate 1
On 3, a protective film 35 is formed so as to cover the pixel P.

Next, a transparent electrode 37 is formed on the protective film 35, as shown in FIG. Then, the transparent electrode 37 is removed except for the place located above the pixel P as shown in FIG. In this way
The color filter 11 of FIG. 2 is completed.

According to the preferred embodiment of the present invention, when the recording head 7 thus adjusted is used to form the pixels P formed of ink droplets on the substrate 13, the manufactured color filter 11 has less pixel unevenness. Become. Therefore, the pixel P having less unevenness on the substrate 13 by one scan of the recording head 7
The productivity can be improved by forming the film easily and at high speed.

Modified Example FIG. 18 is a plan view showing a modified example of the method for manufacturing a filter as a preferred embodiment of the present invention. Each ink drop I
The dotted line drawn around the circle indicates an example of the range in which the ink droplet I spreads.

In the pixel forming step, the recording head 7 forms a driving waveform generating circuit for each of the driving waveforms of a plurality of different nozzles prepared in advance, and the nozzles are driven at the same timing based on the selected driving waveform. It may be driven. That is, the first ejection timing Ti1
At the eighth ejection timing Ti8, for example, the first drive waveforms COM1 to COM3 for each of 180 nozzles.
Alternatively, any one of the drive waveforms COM3 may be selected and ejected.

FIG. 19 shows the piezoelectric element drive circuit 10 of FIG.
FIG. 20 is a circuit diagram showing a configuration example of 1a, and FIG. 20 is a circuit diagram showing a configuration example of the logic 27a of FIG. Incidentally, FIG.
9 shows a circuit diagram for driving the recording head 7 as shown in FIG.

The piezo element drive circuit 101a shown in FIG.
The structure and function are almost the same as those of the piezo element drive circuit 101 of FIG. 6, and therefore the different points will be mainly described. In the piezo element drive circuit 101a, in order to drive each nozzle at the same timing by the drive waveform selected from the drive waveforms of a plurality of different nozzles prepared in advance, the first drive waveform generation circuit 15a to the third drive waveform generation circuit 15a. A drive waveform generation circuit 15c is provided. First drive waveform generation circuit 15
The a to third drive waveform generation circuits 15c have a function of generating the first drive waveform COM1 to the third drive waveform COM3, respectively. The logic 27a uses the first drive waveform COM based on the selection signals DH and DL as shown in FIG.
Based on the drive waveform selected from the first to third drive waveforms COM3, any one of the analog switch driver 29a to the analog switch driver 29c is selected and driven. Therefore, as shown in FIG. 18, the recording head 7 ejects the ink droplets I for each ejection cycle T based on, for example, the first drive waveform COM1.
It is possible to discharge at 1.

According to this modified example, when the ink is ejected into the pixel by, for example, 8 ink drops, the ejection timing can be set to 1/3 times, and when the ejection is performed at the same drive frequency. The substrate 1 of the recording head 7
The moving speed with respect to 3 can be tripled, and the productivity can be further improved. Further, when the discharge timings are the same, the discharge interval for one pixel can be narrowed, and a higher-definition color filter can be dealt with.

The present invention is not limited to the above embodiment,
Various modifications can be made without departing from the scope of the claims.

For example, it goes without saying that the recording head 7 may move with respect to the substrate 13 or the substrate 13 may move with respect to the fixed recording head 7. That is, the recording head 7 may be configured to eject ink droplets onto the substrate 13 while scanning the substrate 13 relative to the substrate 13.

Further, in the above embodiment, the color filter composed of three colors of RGB has been described as an example, but the present invention is not limited to this, and the present invention can be applied to a color filter of monocolor, two colors, or other plural colors. You can also

A part of each structure of the above-mentioned embodiment can be omitted or can be arbitrarily combined so as to be different from the above.

The method for producing a filter of the present invention is not limited to the production of a color filter for liquid crystal display,
For example, it can be applied to the manufacture of an EL (electroluminescence) display element. An EL display element has a structure in which a thin film containing a fluorescent inorganic or organic compound is sandwiched between an anode and a cathode, and electrons and holes are injected into this thin film to recombine to generate excitons. It is an element that produces (exciton) and emits light by utilizing the emission of light (fluorescence / phosphorescence) when the exciton is deactivated.
Of the fluorescent materials used for such EL display elements, materials exhibiting red, green, and blue emission colors are inkjet-patterned on an element substrate such as a TFT by using the manufacturing method of the present invention, thereby A light emitting full color EL display device can be manufactured. The range of the filter in the present invention includes such an EL display element substrate.

The EL display element manufactured by using the method for manufacturing a filter of the present invention is applied to the field of low information such as segment display and still image display of simultaneous light emission, for example, pictures, characters and labels, or point,
It can also be used as a light source having a line or surface shape. In addition, passively driven display elements and TFTs
By using an active element such as an element for driving, a full-color display element having high brightness and excellent responsiveness can be obtained.

The recording head 7 of the above embodiment is
Although one type of ink among R, G, and B can be ejected, it is also possible to eject two or three types of ink among these types of ink at the same time.

[0081]

According to the present invention, a method of manufacturing a filter which can improve productivity by forming a plurality of pixels on a substrate at a high speed with little unevenness by scanning the substrate once by the recording head, and It is possible to provide a filter with less color unevenness.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration example of a substrate on which filters are arranged.

FIG. 2 is a plan view showing a configuration example of part of a filter manufactured from the substrate of FIG.

FIG. 3 is a plan view showing an example of how a color filter is manufactured by a filter manufacturing method according to a preferred embodiment of the present invention.

FIG. 4 is a diagram showing a computer, a control panel, various controlled objects, and the like.

FIG. 5 is a diagram showing a configuration example of a recording head.

6 is a circuit diagram showing an electrical configuration example of the piezo element drive circuit of FIG.

7 is a circuit diagram showing an electrical configuration example of the logic of FIG.

8 is a diagram showing an operation example of the logic of FIG. 7. FIG.

9 is a diagram showing an example of the drive waveforms of FIG.

FIG. 10 is a diagram showing an example of the weight of the ink droplet when the drive voltage in FIG. 9 is changed, and a diagram showing an example of the weight of the ink droplet with respect to the voltage.

FIG. 11 is a diagram showing an example of a drive waveform.

FIG. 12 is a flowchart showing an example of a filter manufacturing method.

FIG. 13 is a diagram showing an example of variation in the amount of ink droplets ejected from each nozzle in the recording head.

FIG. 14 is a diagram showing an example of a total ink amount of ink droplets when a pixel is formed by ejecting ink droplets a plurality of times by driving a nozzle according to a selected drive waveform.

FIG. 15 is a diagram showing an example of the amount of ink droplets ejected from each nozzle of the recording head.

FIG. 16 is a sectional view showing an example of a manufacturing process of a color filter.

FIG. 17 is a cross-sectional view showing an example of a manufacturing process of a color filter.

FIG. 18 is a plan view showing a modified example of the filter manufacturing method according to the preferred embodiment of the present invention.

FIG. 19 is a circuit diagram showing an electrical configuration example of a piezo element drive circuit of a modified example.

20 is a circuit diagram showing an electrical configuration example of the logic of FIG.

[Explanation of symbols]

7 heads (recording heads) 11 Color filter (filter) 13 board 91 nozzles COM1 First drive waveform COM2 Second drive waveform COM3 Third drive waveform I ink drop P pixels PB pixel PG pixel PR pixel

Claims (12)

[Claims] 1. A recording head having a plurality of nozzles for ejecting ink droplets, wherein the plurality of nozzles ejects the ink droplets onto the substrate a plurality of times to form a plurality of pixels on the substrate, respectively. A method of manufacturing a filter, wherein the droplet amount of the ink droplets ejected from the plurality of nozzles can be set for each ejection timing of the plurality of nozzles. Production method. 2. The total droplet amount of a plurality of ink droplets ejected to each of the plurality of pixels is a substantially constant amount in each of the pixels.
A method for manufacturing the filter according to. 3. The droplet amount set for each of the ejection timings is set by selecting from a plurality of different drive waveforms prepared in advance for driving the plurality of nozzles. The method for manufacturing the filter according to claim 1 or 2. 4. The plurality of nozzles are driven at different timings for each of the same drive waveforms selected for each nozzle from the plurality of drive waveforms prepared in advance. A method for manufacturing the filter according to. 5. The plurality of nozzles are driven at the same timing by a drive waveform selected for each nozzle from the plurality of drive waveforms prepared in advance. Manufacturing method of filter. 6. A plurality of pixels are formed on the substrate by ejecting the ink droplets from the plurality of nozzles onto the substrate a plurality of times by a recording head having a plurality of nozzles ejecting the ink droplets. A method of manufacturing a filter, comprising: a measuring step of measuring a droplet amount of ink droplets ejected from each of the plurality of nozzles of the recording head; and a total of the ink droplets forming each pixel. A selection step of selecting a drive waveform of the nozzle that drives each of the nozzles a plurality of times so that the droplet amount is substantially constant, from a plurality of different drive waveforms of the different nozzles prepared in advance; Drive each nozzle of the recording head a plurality of times based on the drive waveform of And a pixel forming step for forming each of the pixels. 7. The method of manufacturing a filter according to claim 6, wherein, in the pixel forming step, the nozzles are driven at different timings for respective drive waveforms of the different nozzles prepared in advance. 8. The filter according to claim 6, wherein in the pixel forming step, the nozzles are driven at the same timing based on the drive waveforms of the plurality of different nozzles prepared in advance. Manufacturing method. 9. The drive waveforms of the plurality of different nozzles include a first drive waveform having a drive voltage of about 110% of a standard drive voltage of the nozzle and a standard drive voltage of the nozzle. The second drive waveform and the third drive waveform having a drive voltage of approximately 90% of the standard drive voltage of the nozzle are prepared in advance. A method for manufacturing the filter according to any one of 1. 10. The substrate according to claim 6, wherein the substrate is provided with a receiving layer that accommodates the ink droplets ejected from each of the nozzles a plurality of times. Filter manufacturing method. 11. The filter according to claim 6, wherein the recording head ejects the ink droplets onto the substrate while scanning relative to the substrate. Production method. 12. A recording head having a plurality of nozzles for ejecting ink droplets, wherein a plurality of pixels are formed on the substrate by ejecting the ink droplets from the plurality of nozzles onto the substrate a plurality of times, respectively. In the filter manufactured by, the droplet amount of the ink droplets ejected from the plurality of nozzles is set for each ejection timing of the plurality of nozzles, and the ink droplets are ejected from the plurality of nozzles based on the setting. A filter characterized by being manufactured by discharging.