JPH10278314A - Color filter, manufacture thereof, display, and apparatus equipped with the display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a color filter where unevenness of color is suppressed visually with high yield by allocating ink jet heads for jetting ink of respective colors based on the measurements of hitting position of ink jetted from each ink jet head. SOLUTION: Hitting position is differentiated among heads for respective colors and a head confined within an allowable value is employed coloring a pixel of each color. Since a head which can not be used for coloring a blue pixel because of slightly low accuracy of hitting position can be used for coloring a red or green pixel, manufacturing yield of ink jet head can be increased as compared with a case where the most stringent allowance of accuracy of blue head is applied to all ink jet heads. A color filter substrate is colored using ink jet heads allocated to respective colors in such a manner thus producing a color filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter manufacturing method, a color filter, and a display for manufacturing a color filter by discharging ink toward a substrate by an ink jet head and coloring each pixel of the color filter. The present invention relates to a device and a device including the display device.

[0002]

2. Description of the Related Art Generally, a liquid crystal display device is mounted on a personal computer, a word processor, a pachinko game console, an automobile navigation system, a small television, and the like, and the demand has been increasing in recent years. However, liquid crystal display devices are expensive, and the demand for cost reduction of liquid crystal display devices is increasing year by year.

A color filter constituting a liquid crystal display device is configured by arranging pixels of red (R), green (G), blue (B), etc. on a transparent substrate. Is provided with a black matrix for shielding light in order to enhance display contrast.

The colored pixel portion of the color filter is formed by a dyeing method, a pigment dispersion method, an electrodeposition method, or the like.

[0005] In view of the demand for cost reduction of color filters, a method of forming pixels by a printing method or an inkjet method has been proposed. However, in the printing method, since the steps of transferring and drying from the printing plate are repeated three times for each of R, G, and B pixels to form a colored pixel portion, there is a problem that the yield is reduced.

On the other hand, with respect to the ink jet method, for example, in JP-A-59-75205, a colored liquid containing three colors of R, G and B is jetted onto a substrate by an ink jet method, and each colored liquid is ejected. It has been proposed to form a colored image area by drying. In such an ink jet system, each of the R, G, and B pixels can be formed at one time, so that a great simplification of the manufacturing process and a great cost reduction effect can be obtained.

[0007]

However, in the case of the ink jet system, since the pixels are colored by using a plurality of ink discharge nozzles, it is impossible to make the landing position accuracy of the ink discharged from each nozzle completely uniform. It is almost impossible. Therefore, the applicant of the present application has filed Japanese Patent Application No. 8-18005.
No. 64 proposes a method of adhering ink to a color filter substrate in a columnar state other than a drop form.

However, when the pixels are colored by the ink-jet method, the inventors of the present invention disclose that the density distribution in the pixels exists to some extent, and depending on the degree, color unevenness of the color filter due to a landing position shift occurs. Found.

Conventionally, without considering the influence of the landing position deviation,
Manufactures color filters using multiple nozzles,
The production yield of color filters was poor.

Further, if the allowable range of the landing position deviation is extremely narrowed to solve this problem, it is difficult to manufacture such an ink jet head with high accuracy, and the problem that the yield of the head deteriorates occurs. .

Further, it has been found in these experiments that the degree of appearance of streak-like unevenness generated from a landing position shift differs depending on colors.

Further, if the variation in the ink ejection amount of each nozzle other than the landing position is too large,
It has been experimentally found that even if the same correction is performed for each color, the degree of unevenness is different.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method of manufacturing a color filter capable of producing a color filter having little color unevenness with high yield when visually observed. .

Another object of the present invention is to improve the yield of an ink jet head used for manufacturing an ink jet type color filter.

[0015]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, a method of manufacturing a color filter according to the present invention includes manufacturing a color filter by discharging ink toward a substrate by a plurality of inkjet heads and coloring each pixel of the color filter to a plurality of colors. A measuring step of measuring a landing position of ink ejected from each ink jet head, and an allocating step of allocating an ink jet head used for discharging each color ink based on a measurement result in the measuring step. It is characterized by doing.

In the method of manufacturing a color filter according to the present invention, in the assigning step, the landing position accuracy is within an allowable value based on the measurement result of the landing position, and the measured value varies. It is characterized in that the heads are assigned as blue, red and green coloring heads in ascending order.

Further, in the method for manufacturing a color filter according to the present invention, in the assigning step, blue,
The present invention is characterized in that the allowable value of the ink landing position accuracy is changed and set for each of the red and green colors, and that the ink jet head within the allowable value is allocated for coloring each color.

In the method of manufacturing a color filter according to the present invention, in the assigning step, the allowable value of the landing position accuracy is narrowed in the order of green, red, and blue, and the ink jet head within each allowable value is set for each color. It is characterized by being allocated for coloring.

Further, in the method for manufacturing a color filter according to the present invention, in the measuring step, the positional accuracy of the landed ink is obtained by measuring an ink pattern discharged on the glass substrate.

In the method for manufacturing a color filter according to the present invention, the ink jet head is a head for discharging ink using thermal energy,
It is characterized by having a thermal energy generator for generating thermal energy given to the ink.

The method of manufacturing a color filter according to the present invention is a method of manufacturing a color filter by discharging ink toward a substrate by a plurality of ink jet heads and coloring each pixel of the color filter to a plurality of colors. A measuring step of measuring a variation in ink ejection amount among a plurality of ink ejection nozzles in each head, and an allocating step of allocating an ink jet head used for ejecting ink of each color based on a measurement result in the measuring step. Are provided.

In the method of manufacturing a color filter according to the present invention, in the assigning step, the variation of the ink ejection amount among the plurality of ink ejection nozzles is within an allowable value based on the measurement result of the ink ejection amount. Yes,
In addition, the heads are assigned as blue, red, and green coloring heads in order from the inkjet head having the smallest variation in the measured values.

In the method for manufacturing a color filter according to the present invention, in the assigning step, blue,
It is characterized in that the permissible value of the variation amount of the ink ejection amount is changed and set for each of the red and green colors, and the inkjet head within the permissible value is allocated for coloring each color.

In the method of manufacturing a color filter according to the present invention, in the assigning step, the allowable value of the variation of the ink discharge amount is narrowed in the order of green, red, and blue, and the ink jet head within the respective allowable values is reduced. Are assigned for coloring each color.

Further, in the method for manufacturing a color filter according to the present invention, the measuring step is to measure an ink pattern discharged on the glass substrate, thereby obtaining an ink discharge amount of each ink discharge nozzle.

In the method of manufacturing a color filter according to the present invention, the ink jet head is a head for discharging ink using thermal energy,
It is characterized by having a thermal energy generator for generating thermal energy given to the ink.

Further, the color filter according to the present invention comprises:
A color filter manufactured by discharging ink toward a substrate with multiple inkjet heads and coloring each pixel of the color filter with multiple colors, and measuring the landing position of the ink discharged from each inkjet head Measuring step, based on the measurement result in the measuring step, an allocating step of allocating an inkjet head used for discharging ink of each color, and a coloring step of coloring the substrate with the inkjet head allocated in the allocating step It is characterized by being manufactured.

The display device according to the present invention is a color filter manufactured by discharging ink toward a substrate by a plurality of ink jet heads and coloring each pixel of the color filter to a plurality of colors. A measuring step of measuring a landing position of ink ejected from each ink jet head, an assigning step of assigning an ink jet head to be used for ejecting ink of each color based on a measurement result in the measuring step, A color filter manufactured through a coloring step of coloring the substrate with an ink jet head and a light amount varying means for varying a light amount are integrally provided.

Further, a device provided with a display device according to the present invention is a color filter manufactured by discharging ink toward a substrate by a plurality of ink jet heads and coloring each pixel of the color filter to a plurality of colors. A measuring step of measuring a landing position of ink ejected from each ink jet head, an allocating step of allocating an ink jet head used for discharging each color ink based on a measurement result in the measuring step, A display device integrally including a color filter manufactured through a coloring step of coloring the substrate by the ink jet head allocated in the above, and a light amount varying unit for varying a light amount, and supplying an image signal to the display device. Image signal supply means.

Further, the color filter according to the present invention comprises:
A color filter in which a plurality of pixels colored in a plurality of colors are formed on a color filter substrate, wherein the density unevenness of the plurality of pixels differs for each color.

Further, in the color filter according to the present invention, the plurality of colors are green, red, and blue, and the density unevenness of each pixel decreases in the order of green, red, and blue. I have.

Further, the display device according to the present invention is a color filter in which a plurality of pixels colored in a plurality of colors are formed on a color filter substrate, wherein the density unevenness of the plurality of pixels is reduced for each color. It is characterized in that different color filters and light amount varying means for varying the light amount are integrally provided.

An apparatus provided with a display device according to the present invention is a color filter in which a plurality of pixels colored in a plurality of colors are formed on a color filter substrate, and the density unevenness of the plurality of pixels is reduced. And a display device that integrally includes a color filter that differs for each color and a light amount varying unit that varies a light amount, and an image signal supply unit that supplies an image signal to the display device.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing the configuration of an embodiment of a color filter manufacturing apparatus.

In FIG. 1, reference numeral 51 denotes an apparatus mount; 52, an XYθ stage disposed on the mount 51; 53, a color filter substrate set on the XYθ stage 52;
Is a color filter formed on the color filter substrate 53, 55 is R (red) for coloring the color filter 54,
G (green) and B (blue) inkjet heads; 58, a controller for controlling the overall operation of the color filter manufacturing apparatus 90; 59, a teaching pendant (personal computer), which is a display unit of the controller; Is shown.

FIG. 2 is a configuration diagram of a control controller of the color filter manufacturing apparatus 90. 59 is a teaching pendant which is an input / output means of the controller 58;
Reference numeral denotes a display unit for displaying information such as the progress of manufacturing and whether or not the head is abnormal. Reference numeral 60 denotes an operation unit (keyboard) for instructing the operation of the color filter manufacturing apparatus 90 and the like.

Reference numeral 58 denotes a controller for controlling the overall operation of the color filter manufacturing apparatus 90; 65, an interface for transferring data to and from the teaching pendant 59; 66, a CPU for controlling the color filter manufacturing apparatus 90; ROM, which stores a control program for operating the color filter, 68, a RAM for storing abnormality information and the like, 70, a discharge control unit for controlling the discharge of ink into each pixel of the color filter, 71, a color filter manufacturing apparatus A stage control unit 90 for controlling the operation of the 90 XYθ stage 52 is connected to the controller 58, and shows a color filter manufacturing apparatus that operates according to the instruction.

Next, FIG. 3 is a view showing the structure of the ink jet head 55 used in the color filter manufacturing apparatus 90 described above. In FIG. 1, three inkjet heads are provided corresponding to three colors of R, G, and B,
Since these three heads have the same structure, FIG. 3 shows only one of the three heads as a representative structure.

In FIG. 3, the ink jet head 55
Is schematically composed of a heater board 104 as a substrate on which a plurality of heaters 102 for heating ink are formed, and a top plate 106 overlaid on the heater board 104. A plurality of discharge ports 108 are formed in the top plate 106, and a tunnel-shaped liquid path 110 communicating with the discharge ports 108 is formed behind the discharge ports 108. Each liquid channel 110 is separated from an adjacent liquid channel by a partition 112. Each liquid path 110 is commonly connected to one ink liquid chamber 114 at the rear thereof, and ink is supplied to the ink liquid chamber 114 through an ink supply port 116. The liquid is supplied to each of the liquid paths 110.

The heater board 104 and the top plate 106
Each heater 102 is positioned so as to come to a position corresponding to each liquid path 110, and assembled in a state as shown in FIG.
Although only two heaters 102 are shown in FIG. 3, one heater 102 is
Are arranged one by one. Then, when a predetermined drive pulse is supplied to the heater 102 in an assembled state as shown in FIG. 3, the ink on the heater 102 boils to form bubbles, and the ink expands from the ejection openings 108 by volume expansion of the bubbles. Extruded and discharged. Therefore, it is possible to control the driving pulse applied to the heater 102, for example, by controlling the magnitude of the electric power, to adjust the size of the bubble,
The volume of the ink ejected from the ejection port can be freely controlled.

In the color filter of the present invention, a light-transmitting substrate is preferable as the substrate, and a glass substrate is generally used. However, a glass substrate having necessary characteristics such as transparency and mechanical strength as a liquid crystal color filter is used. However, it is not limited to a glass substrate.

FIG. 4 is a diagram showing an example of a manufacturing process of a color filter.

FIG. 4A shows a glass substrate 1 provided with a light transmitting portion 7 and a black matrix 2 as a light shielding portion. First, a resin composition curable by light irradiation or light irradiation and heating and having an ink receiving property is applied to the substrate 1 on which the black matrix 2 is formed, and prebaking is performed as necessary to form the resin layer 3. It is formed (FIG. 4B). For forming the resin layer 3, a coating method such as spin coating, roll coating, bar coating, spray coating, or dip coating can be used, and is not particularly limited.

Next, a portion of the resin layer, which is shielded from light by the black matrix 2, is subjected to pattern exposure in advance by using a photomask 4 to cure a part of the resin layer so that ink is not absorbed by a portion 5 (non-colored portion). 4) (FIG. 4)
(C)), and then R,
Each color of G and B is colored at a time (FIG. 4D), and the ink is dried if necessary.

As the photomask 4 used at the time of pattern exposure, a photomask 4 having an opening for curing a light-shielded portion by a black matrix is used. At this time, it is necessary to apply a relatively large amount of ink in order to prevent color loss of the colorant in a portion in contact with the black matrix. Therefore, it is preferable to use a mask having an opening smaller than the (light-shielding) width of the black matrix.

As the ink used for coloring, both dye-based and pigment-based inks can be used, and both liquid inks and solid inks can be used.

As the curable resin composition used in the present invention, any resin composition can be used as long as it has an ink receiving property and can be cured by light irradiation or at least one of light irradiation and heating. Yes, as a resin, for example, acrylic resin, epoxy resin, silicone resin, hydroxypropyl cellulose, hydroxyethyl cellulose,
Examples include cellulose derivatives such as methylcellulose and carboxymethylcellulose, and modified products thereof.

It is also possible to use a photoinitiator (crosslinking agent) for causing these resins to undergo a crosslinking reaction by light or light and heat. As a photoinitiator, dichromate,
Bisazide compounds, radical initiators, cationic initiators, anionic initiators and the like can be used. These photoinitiators can be used as a mixture or in combination with other sensitizers. Further, a photoacid generator such as an onium salt can be used in combination as a crosslinking agent. Note that heat treatment may be performed after light irradiation in order to further promote the crosslinking reaction.

The resin layer containing these compositions is extremely excellent in heat resistance, water resistance and the like, and can sufficiently withstand a high temperature in a subsequent step or a washing step.

As the ink jet system used in the present invention, a bubble jet type using an electrothermal converter or a piezo jet type using a piezoelectric element can be used as an energy generating element. It can be set arbitrarily.

Although this embodiment shows an example in which a black matrix is formed on a substrate, the black matrix is formed on the resin layer after forming a curable resin composition layer or after coloring. However, there is no particular problem, and the form is not limited to this example. Also,
As a forming method thereof, it is preferable to form a metal thin film on a substrate by sputtering or vapor deposition and pattern it by a photolithography process, but it is not limited thereto.

Next, only the light irradiation, only the heat treatment, or the light irradiation and the heat treatment are performed to cure the curable resin composition (FIG. 4E), and a protective layer 8 is formed as necessary (FIG. 4E).
(F). In the drawing, hν indicates the intensity of light, and in the case of heat treatment, heat is applied instead of the light of hν. The protective layer 8 can be formed using a second resin composition of a photo-curing type, a thermo-setting type or a combination of light and heat, or can be formed by vapor deposition or sputtering using an inorganic material. Any material can be used as long as it has the transparency in this case and can sufficiently withstand the subsequent ITO forming process, alignment film forming process, and the like.

FIG. 5 is a sectional view showing the basic structure of a color liquid crystal display device 30 incorporating the above color filters.

11 is a polarizing plate, 1 is a transparent substrate such as glass, 2 is a black matrix, 3 is a resin composition layer, 8
Is a protective layer, 16 is a common electrode, 17 is an alignment film, 18 is a liquid crystal compound, 19 is an alignment film, 20 is a pixel electrode, 21 is a glass substrate, 22 is a polarizing plate, and 23 is backlight. 5
Reference numeral 3 denotes the color filter described above, and reference numeral 24 denotes a counter substrate.

The color liquid crystal display device 30 includes the color filter 53 and the opposing substrate 24, the liquid crystal compound 18 sealed therein, and the substrate 2 facing the color filter 53.
Transparent pixel electrodes 20 are formed in a matrix inside 1. The color filter 53 is arranged so that R, G, and B pixels are arranged at the position of the pixel electrode 20.

Further, an alignment film 17 is formed on the inside of both substrates, and by subjecting this to a rubbing treatment, liquid crystal molecules can be aligned in a certain direction. Polarizing plates 11 and 22 are adhered to the outside of each substrate, and a liquid crystal compound is filled in the gap between these substrates. As the backlight, a combination of a fluorescent lamp and a scattering plate (both are not shown) is generally used, and the liquid crystal compound 18 functions as an optical shutter for changing the transmittance of the backlight 23. Display.

An example in which such a liquid crystal display device is applied to an information processing device will be described with reference to FIGS.

FIG. 6 is a block diagram showing a schematic configuration when the above-mentioned liquid crystal display device is applied to an information processing device having functions as a word processor, a personal computer, a facsimile device, and a copying device.

In the figure, reference numeral 1801 denotes a control unit for controlling the entire apparatus, which includes a CPU such as a microprocessor and various I / O ports, outputs control signals and data signals to each unit, and controls signals from each unit. And control by inputting data signals. Reference numeral 1802 denotes a display unit, on which various menus, document information, and the image reader 18 are displayed.
In step 07, the read image data and the like are displayed. 18
Reference numeral 03 denotes a transparent pressure-sensitive touch panel provided on the display unit 1802. By pressing the surface of the touch panel with a finger or the like, it is possible to input items, coordinate positions, and the like on the display unit 1802.

Reference numeral 1804 denotes an FM (Frequency Modulation) sound source unit, which stores music information created by a music editor or the like as digital data in the memory unit 1810 or the external storage device 1812, reads out the FM information from the memory or the like, and reads the FM information.
The modulation is performed. The electric signal from the FM sound source unit 1804 is converted into an audible sound by the speaker unit 1805.
The printer unit 1806 is used as an output terminal of a word processor, a personal computer, a facsimile machine, and a copying machine.

Reference numeral 1807 denotes an image reader unit for reading and inputting original data photoelectrically, which is provided in the original conveying path and reads various originals such as facsimile originals and copy originals.

Reference numeral 1808 denotes a facsimile transmission of the original data read by the image reader unit 1807 and a facsimile (F) for receiving and decoding the transmitted facsimile signal.
AX), and has an external interface function. Reference numeral 1809 denotes a telephone unit having various telephone functions such as a normal telephone function and an answering machine function.

Reference numeral 1810 denotes a ROM that stores a system program, a manager program, other application programs, character fonts, a dictionary, and the like; an application program and document information loaded from an external storage device 1812; and a memory that includes a video RAM and the like. Department.

Reference numeral 1811 denotes a keyboard for inputting document information and various commands.

Reference numeral 1812 denotes an external storage device having a storage medium such as a floppy disk or a hard disk. The external storage device 1812 stores document information, music or voice information,
A user application program and the like are stored.

FIG. 7 is a schematic overview of the information processing apparatus shown in FIG.

In the figure, reference numeral 1901 denotes a flat panel display using the above-mentioned liquid crystal display device, which displays various menus, graphic information, document information and the like. By pressing the surface of the touch panel 1803 with a finger or the like on the display 1901, coordinate input and item designation input can be performed. A handset 1902 is used when the device functions as a telephone. Keyboard 190
3 is detachably connected to the main body via a cord,
Various document functions and various data inputs can be performed. The keyboard 1903 has various function keys 1904.
Etc. are provided. 1905 is an external storage device 1812
This is the slot for the floppy disk.

Reference numeral 1906 denotes a sheet placing portion on which a document to be read by the image reader portion 1807 is placed. The read document is discharged from the rear of the apparatus. In the case of facsimile reception or the like, printing is performed by the inkjet printer 1907.

When the information processing apparatus functions as a personal computer or a word processor, various information input from the keyboard section 1811 is processed by the control section 1801 in accordance with a predetermined program, and
The image is output to an image 806.

When functioning as a receiver of a facsimile apparatus, facsimile information input from a facsimile transmission / reception unit 1808 via a communication line is received and processed by a control unit 1801 according to a predetermined program.
Is output as a received image.

When functioning as a copier, a document is read by an image reader 1807 and the read document data is sent to a printer 18 via a controller 1801.
06 is output as a copy image. When functioning as a facsimile receiver, the image reader unit 1
The original data read by 807 is transmitted to control unit 180.
After transmission processing according to a predetermined program by 1
The data is transmitted to the communication line via the facsimile transmission / reception unit 1808.

The information processing apparatus described above may be of an integrated type having a built-in ink jet printer as shown in FIG. 8, and in this case, the portability can be further improved. In the figure, parts having the same functions as those in FIG. 7 are denoted by the corresponding reference numerals.

Next, an example of a method of measuring a landing position of ink ejected from a nozzle of an ink jet head, which is a characteristic part of the present invention, will be described.

FIG. 9 is a view showing a state where the ink has completely landed at an ideal position, and FIG. 10 is a view showing an actual landing position.

Point A in FIG. 10 shows a state where the ink landing position is shifted from the ideal position by +5 μm in the Y direction. Similarly, point B is −5 μm in the Y direction, and point C is −5 μm in the X direction.
m, point D is +5 μm in the X direction, point E is −3 μm in the Y direction
The state shifted by +5 μm in the m and X directions is shown.

FIG. 11 shows a pixel pattern of a stripe type color filter used in a personal computer or the like. FIG. 12 shows an ideal ink density distribution in a section taken along line AA ′ of FIG. FIG. 13 is a diagram showing the density distribution in the pixel when the ink landing position is shifted, and the ink density distribution is biased due to the ink landing position shift which has been a problem of the present inventors. It shows the state where it is.

When the coloring operation is performed by inclining the ink jet head by the angle θ in accordance with the pitch of the pixel to be colored as shown in FIG. 14, the deviation of the landing position is represented by ΔX = Xcos θ + Y sin θ.

When the landing position shift of ΔX occurs, for example, a density distribution as shown in FIG. 13 occurs in the width direction within one red pixel row, and even if the ink ejection amount for each pixel row is made uniform. When viewed as a whole color filter, streak-like unevenness is visually observed at a certain place.

Although this unevenness is responsive and difficult to formulate, it was found by examining the relationship between the actual landing position deviation and the visual appearance of the unevenness that the results differ for each color. Has found. Specifically, if the color filter is composed of three color pixels of red, blue, and green, the color unevenness is most conspicuous even if the deviation of the ink landing position of the blue pixel is small, and the red pixel is next to blue. It was found that the green pixels were the most inconspicuous in color unevenness.

For this reason, in the present embodiment, the ink ejection accuracy of a plurality of ink jet heads is measured, the head with the highest ink landing position accuracy is used for coloring the blue pixels, and the head with the next highest landing position accuracy is set to red. And a head with a slightly worse landing position accuracy is used for coloring the green pixel. That is, the allowable value of the landing position accuracy is made different for each head used for coloring each color, and the heads falling within the respective allowable values are used for coloring the pixels of that color. In this way, even if the landing position accuracy is somewhat poor and the head cannot be used for coloring blue pixels, it can be used for coloring red or green pixels. The production yield of the inkjet head can be improved as compared with the case where the value is adjusted to the blue head with the highest accuracy. And
The color filter substrate is colored using the ink jet heads assigned to the respective colors by the method as described above, and the color filter is manufactured. This makes it possible to manufacture a color filter with less color unevenness as seen with the naked eye.

Further, usually, in the production of a color filter, a long ink jet head having a large number of ink discharge nozzles is used. In this case, there is unevenness in the ink discharge amount for each nozzle. When the unevenness of the ink discharge amount occurs, as shown in FIG. 15, a pixel having a large difference in density unevenness is adjacent to the pixel, which causes color unevenness in the color filter. Therefore, in this case as well,
In the same manner as above, the head with the least unevenness in the ink discharge amount for each nozzle is used for coloring the blue pixels, and the head with the least unevenness in the discharge amount is used for coloring the red pixels. Is used for coloring green pixels. In this manner, the production yield of the ink jet head can be improved without lowering the visual quality of the color filters as in the above case. The measurement of the ink ejection amount for each nozzle of the inkjet head is described in, for example, Japanese Patent Application No. 8-105417 filed by the present applicant.

The present invention includes a means (for example, an electrothermal converter or a laser beam) for generating thermal energy as energy used for performing ink ejection, particularly in an ink jet recording system. The printing apparatus of the type that causes a change in the state of the ink has been described.
High definition can be achieved.

The typical configuration and principle are described in, for example, US Pat. Nos. 4,723,129 and 4,740.
It is preferable to use the basic principle disclosed in the specification of Japanese Patent No. 796. This method can be applied to both the so-called on-demand type and continuous type. In particular, in the case of the on-demand type, liquid (ink)
By applying at least one drive signal corresponding to the recorded information and providing a rapid temperature rise exceeding the film boiling to an electrothermal transducer arranged corresponding to the sheet or the liquid path in which Since thermal energy is generated in the electrothermal transducer and film boiling occurs on the heat-acting surface of the recording head, bubbles in the liquid (ink) corresponding to this drive signal on a one-to-one basis can be formed. It is valid. By discharging the liquid (ink) through the discharge opening by the growth and contraction of the bubble, at least one droplet is formed. When the drive signal is formed into a pulse shape, the growth and shrinkage of the bubble are performed immediately and appropriately, so that the ejection of the liquid (ink) having particularly excellent responsiveness can be achieved, which is more preferable.

As the pulse-shaped driving signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. Further, if the conditions described in US Pat. No. 4,313,124 relating to the temperature rise rate of the heat acting surface are adopted, more excellent recording can be performed.

The configuration of the recording head is not limited to the combination of the discharge port, the liquid path, and the electrothermal converter (linear liquid flow path or right-angle liquid flow path) as disclosed in the above-mentioned respective specifications. A configuration using U.S. Pat. No. 4,558,333 or U.S. Pat. No. 4,459,600, which discloses a configuration in which a heat acting surface is arranged in a bent region, is also included in the present invention. In addition, for multiple electrothermal transducers,
JP-A-59-123670 which discloses a configuration in which a common slot is used as a discharge part of an electrothermal transducer, and JP-A-59-123670 which discloses a configuration in which an opening for absorbing a pressure wave of thermal energy corresponds to a discharge part. A configuration based on 138461 may be adopted.

Further, as a full-line type recording head having a length corresponding to the width of the maximum recording medium that can be recorded by the recording apparatus, the length is determined by combining a plurality of recording heads as disclosed in the above specification. This may be either a configuration satisfying the above requirements or a configuration as a single recording head formed integrally.

In addition, the print head is replaceable with a print head of a replaceable chip type, which can be electrically connected to the main body of the apparatus or supplied with ink from the main body of the apparatus, or is integrated with the print head itself. Alternatively, a cartridge type recording head provided with an ink tank may be used.

It is preferable to add recovery means for the recording head, preliminary auxiliary means, and the like provided as components of the recording apparatus of the present invention since the effects of the present invention can be further stabilized. . If these are specifically mentioned, capping means for the recording head, cleaning means, pressurizing or suction means, preheating means using an electrothermal transducer or another heating element or a combination thereof, and printing Performing a preliminary ejection mode for performing another ejection is also effective for performing stable printing.

In the embodiments of the present invention described above, the ink is described as a liquid. However, an ink which solidifies at room temperature or lower, or an ink which softens or liquefies at room temperature may be used. It is only necessary that the ink be in a liquid state when the recording signal is applied.

In addition, in order to positively prevent the temperature rise due to thermal energy as energy for changing the state of the ink from the solid state to the liquid state,
Alternatively, in order to prevent evaporation of the ink, an ink which solidifies in a standing state and liquefies by heating may be used. In any case, the application of heat energy causes the ink to be liquefied by application of the heat energy according to the recording signal and the liquid ink to be ejected, or to start to solidify when reaching the recording medium. The present invention is also applicable to a case where an ink having a property of liquefying for the first time is used. In such a case, as described in JP-A-54-56847 or JP-A-60-71260, the ink is held in a liquid state or a solid state in the concave portion or through hole of the porous sheet. It is good also as a form which opposes an electrothermal transducer. In the present invention, the most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

[0092]

As described above, according to the present invention,
A high-quality color filter with little color unevenness can be manufactured visually without lowering the production yield of the inkjet head.

[0093]

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an embodiment of a color filter manufacturing apparatus.

FIG. 2 is a diagram illustrating a configuration of a control unit that controls the operation of the color filter manufacturing apparatus.

FIG. 3 is a diagram illustrating a structure of an ink jet head used in a color filter manufacturing apparatus.

FIG. 4 is a diagram showing a manufacturing process of a color filter.

FIG. 5 is a cross-sectional view illustrating a basic configuration of a color liquid crystal display device incorporating a color filter according to one embodiment.

FIG. 6 is a diagram illustrating an information processing apparatus in which a liquid crystal display device is used.

FIG. 7 is a diagram illustrating an information processing apparatus in which a liquid crystal display device is used.

FIG. 8 is a diagram illustrating an information processing apparatus in which a liquid crystal display device is used.

FIG. 9 is a diagram illustrating a state where ink has completely landed at an ideal position.

FIG. 10 is a diagram showing actual landing positions of ink.

FIG. 11 is a diagram showing a pixel pattern of a stripe type color filter.

FIG. 12 is a diagram showing an ideal ink density distribution in the AA ′ section of FIG. 11;

FIG. 13 is a diagram illustrating a density distribution in a pixel when an ink landing position is shifted.

FIG. 14 is a diagram illustrating a state in which the inkjet head is inclined.

FIG. 15 is a diagram showing a difference in color unevenness.

[Explanation of symbols]

 52 XYθ stage 53 Glass substrate 54 Color filter 55 Coloring head 58 Controller 59 Teaching pendant 60 Keyboard

Claims (19)

[Claims] 1. A method of manufacturing a color filter by discharging ink toward a substrate by a plurality of ink jet heads and coloring each pixel of the color filter into a plurality of colors, comprising: A method for manufacturing a color filter, comprising: a measuring step of measuring an impact position of ink; and an allocating step of allocating an inkjet head to be used for discharging ink of each color based on a measurement result in the measuring step. 2. In the allocating step, based on a measurement result of the landing position, the landing position accuracy is within an allowable value, and blue, red, and green are sequentially arranged in order from an inkjet head having a small variation in the measured value. 2. The method according to claim 1, wherein the color filter is allocated as a head for coloring. 3. In the assigning step, blue, red,
2. The color filter manufacturing method according to claim 1, wherein an allowable value of the ink landing position accuracy is set differently for each green color, and an ink jet head within each allowable value is allocated for coloring each color. . 4. The method according to claim 1, wherein in the assigning step, an allowable value of the landing position accuracy is narrowed in the order of green, red, and blue, and an ink jet head within each allowable value is assigned for coloring each color. 4. The method for producing a color filter according to item 3. 5. The method according to claim 1, wherein in the measuring step, the positional accuracy of the landed ink is obtained by measuring an ink pattern discharged on the glass substrate. 6. The ink-jet head according to claim 1, wherein the ink-jet head is a head that uses thermal energy to eject ink, and includes a thermal energy generator for generating thermal energy applied to the ink. A method for producing the color filter according to the above. 7. A method of manufacturing a color filter by discharging ink toward a substrate by a plurality of ink jet heads and coloring each pixel of the color filter to a plurality of colors, wherein the plurality of inks in each head are provided. A color filter comprising: a measurement step of measuring a variation in ink ejection amount between ejection nozzles; and an assignment step of assigning an inkjet head used for ejection of each color ink based on a measurement result in the measurement step. Manufacturing method. 8. In the allocating step, the variation of the ink ejection amount among the plurality of ink ejection nozzles is within an allowable value based on the measurement result of the ink ejection amount, and the variation of the measured value is small. The method for manufacturing a color filter according to claim 7, wherein the color filters are assigned as blue, red, and green heads in order from the inkjet head. 9. In the assigning step, blue, red,
8. The method according to claim 7, wherein the permissible value of the variation amount of the ink ejection amount is changed and set for each green color, and an ink jet head within each permissible value is allocated for coloring each color.
3. The method for producing a color filter according to item 1. 10. The method according to claim 1, wherein in the assignment determining step, the allowable value of the variation of the ink ejection amount is narrowed in the order of green, red, and blue, and the ink jet heads within the respective allowable values are assigned for coloring each color. The method for producing a color filter according to claim 9. 11. The method for manufacturing a color filter according to claim 7, wherein in the measuring step, an ink ejection amount of each ink ejection nozzle is obtained by measuring an ink pattern ejected on a glass substrate. 12. The ink-jet head according to claim 7, wherein the ink-jet head is a head that ejects ink using thermal energy, and includes a thermal energy generator for generating thermal energy to be applied to the ink. A method for producing the color filter according to the above. 13. A color filter manufactured by discharging ink toward a substrate by a plurality of inkjet heads to color each pixel of the color filter into a plurality of colors, wherein the ink discharged from each inkjet head is provided. A measuring step of measuring the landing position of the ink jet head, an allocating step of allocating an inkjet head used for discharging each color ink based on the measurement result in the measuring step, and coloring the substrate by the inkjet head allocated in the allocating step. A color filter manufactured through a coloring step. 14. A color filter manufactured by discharging ink toward a substrate by a plurality of inkjet heads and coloring each pixel of the color filter to a plurality of colors, wherein the ink discharged from each inkjet head is provided. A measuring step of measuring the landing position of the ink jet head, an allocating step of allocating an inkjet head used for discharging each color ink based on the measurement result in the measuring step, and coloring the substrate by the inkjet head allocated in the allocating step. A display device, comprising: a color filter manufactured through a coloring step; and a light amount varying unit that varies a light amount. 15. A color filter manufactured by discharging ink toward a substrate by a plurality of ink jet heads to color each pixel of the color filter into a plurality of colors, wherein the ink discharged from each ink jet head is provided. A measuring step of measuring the landing position of the ink jet head, an allocating step of allocating an inkjet head used for discharging each color ink based on the measurement result in the measuring step, and coloring the substrate by the inkjet head allocated in the allocating step. A display device integrally including a color filter manufactured through a coloring step and a light amount varying unit that varies a light amount; and an image signal supply unit that supplies an image signal to the display device. An apparatus provided with a display device. 16. A color filter in which a plurality of pixels colored in a plurality of colors are formed on a color filter substrate, wherein density unevenness of the plurality of pixels differs for each color. . 17. The color according to claim 16, wherein the plurality of colors are green, red, and blue, and the density unevenness of each pixel decreases in the order of green, red, and blue. filter. 18. A color filter in which a plurality of pixels colored in a plurality of colors are formed on a color filter substrate, wherein the density unevenness of the plurality of pixels is different for each color. And a light quantity varying means. 19. A color filter in which a plurality of pixels colored in a plurality of colors are formed on a color filter substrate, wherein the density unevenness of the plurality of pixels is different for each color. A display device, comprising: a display device integrally including light amount varying means; and an image signal supply means for supplying an image signal to the display device.