JP4857743B2 - Color filter substrate manufacturing method, electro-optical device, and electronic apparatus - Google Patents

Description

The present invention relates to a method of manufacturing a color filter substrate, an electro-optical device, and an electronic apparatus.

In recent years, it has been proposed to form a color filter substrate using an inkjet method in which ink is ejected by a droplet ejection head (see, for example, Patent Document 1). In general, the ink jet method is a thin film of a color filter in which ink ejected from a plurality of nozzles provided in a droplet ejection head is repeatedly landed on the substrate while relatively moving the substrate and the droplet ejection head. Is formed.
JP-A-8-114710

  By the way, when producing a color filter substrate using the above-described inkjet method, as shown in FIG. 9A, in order to prevent the spread of the ink i, a partition wall called a bank 201 is formed on the substrate 200. Ink i is applied to the dot formation region 202 partitioned by the bank 201 by an inkjet method.

  However, when the ink i is disposed in the dot formation region 202 described above, the thickness of the color filter layer 203 formed by drying the ink i is thinner in the peripheral portion than in the central portion of the dot formation region 202. For this reason, as shown in FIG. 9B, the color filter layer 203 has a lighter color in the peripheral portion than in the central portion of the dot formation region 202, and light is lost in the peripheral portion of the tod formation region 202. It sometimes occurred.

  Therefore, in order for the color filter layer 203 to have uniform transmission luminance in the dot formation region 203, it is necessary to make the thickness of the color filter layer 203 uniform, but there is a limit to flattening the color filter layer 203. There is a need for improvement.

The present invention has been proposed in view of such conventional circumstances, a method of manufacturing a color filter substrate can be made uniform transmission intensity of the color filter in the area partitioned by partition walls, electric as well It is an object to provide a gas optical device and an electronic apparatus.

In order to achieve this object, a method of manufacturing a color filter substrate according to the present invention includes a step of forming a conductive partition on the substrate and a pigment charged to one polarity in a region partitioned by the partition. placing the ink, and a step of charging in the opposite polarity from that of the pigment partitions by applying a voltage to the partition wall, by Rukoto dried ink, in the peripheral portion than the central portion of the thickness of the region Forming a color filter layer that is thin and has a pigment concentration that is higher in the peripheral portion than in the central portion of the region .
According to this method, although the thickness of the color filter layer is thinner in the peripheral portion than in the central portion of the region, the pigment concentration in the color filter layer is reduced in the color filter layer by attracting the pigment to the charged partition wall. It becomes higher in the peripheral part than in the central part. Therefore, the transmission luminance of the color filter layer can be made uniform within the area partitioned by the partition walls.

On the other hand, the electro-optical device according to the present invention is characterized by comprising a color filter base plate fabricated by the above method.
According to this configuration, it is possible to provide a high-quality electro-optical device having excellent color characteristics.

On the other hand, an electronic apparatus according to the present invention includes the electro-optical device.
According to this configuration, it is possible to provide a high-quality electronic device having excellent color characteristics.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, various structures are illustrated using drawings, but the structures shown in these drawings may be shown with different dimensions from the actual structures in order to show the characteristic parts in an easy-to-understand manner. is there.

(Color filter substrate manufacturing method)
First, a method for manufacturing a color filter substrate to which the present invention is applied will be described.
FIG. 1 is a schematic diagram showing an example of a color filter substrate manufactured by applying the present invention.
As shown in FIG. 1, this color filter substrate has a plurality of color filter regions C formed in a matrix on a rectangular substrate P from the viewpoint of improving productivity. The filter regions C are collectively manufactured by cutting.

  Further, in each color filter region C, an ink containing a red (R) pigment, an ink containing a green (G) pigment, and an ink containing a blue (B) pigment are respectively used by using the liquid ejection device IJ. The red (R), green (G), and blue (B) color filters formed by repeatedly landing on the substrate P are arranged in stripes, for example, as shown enlarged in the box in FIG. Is arranged in.

FIG. 2 is a perspective view showing a droplet discharge device IJ used when manufacturing the color filter substrate.
The droplet discharge device IJ includes a droplet discharge head 10, an X-axis direction drive shaft 11, a Y-axis direction guide shaft 12, a control device 13, a stage 14, a cleaning mechanism 15, a base 16, And a heater 17.

  The stage 14 supports the substrate P, and includes a fixing mechanism (not shown) for fixing the substrate P to a reference position.

  The droplet discharge head 10 is a multi-nozzle type having a plurality of discharge nozzles, and the longitudinal direction and the Y-axis direction are matched. The plurality of ejection nozzles are provided on the lower surface of the droplet ejection head 10 at regular intervals along the Y-axis direction. Ink is ejected from the ejection nozzles of the droplet ejection head 10 onto the substrate P supported by the stage 14.

  An X-axis direction drive motor 18 is connected to the X-axis direction drive shaft 11. The X-axis direction drive motor 18 is composed of a stepping motor or the like, and rotates the X-axis direction drive shaft 11 when a drive signal in the X-axis direction is supplied from the control device 13. When the X-axis direction drive shaft 11 rotates, the droplet discharge head 10 moves in the X-axis direction.

  The Y-axis direction guide shaft 12 is fixed to the base 16. The stage 14 includes a Y-axis direction drive motor 19. The Y-axis direction drive motor 19 is a stepping motor or the like, and moves the stage 14 in the Y-axis direction when a drive signal in the Y-axis direction is supplied from the control device 13.

  The control device 13 supplies a voltage for ink ejection control to the droplet ejection head 10. Further, a drive pulse signal for controlling movement of the droplet discharge head 10 in the X-axis direction is supplied to the X-axis direction drive motor 18, and a drive pulse for controlling movement of the stage 14 in the Y-axis direction is supplied to the Y-axis direction drive motor 19. Supply signal.

  The cleaning mechanism 15 cleans the droplet discharge head 10. The cleaning mechanism 15 is provided with a drive motor (not shown) in the Y-axis direction. The cleaning mechanism 15 moves along the Y-axis direction guide shaft 12 by driving the drive motor in the Y-axis direction. The movement of the cleaning mechanism 15 is also controlled by the control device 13.

  Here, the heater 17 is means for heat-treating the substrate P by lamp annealing, and evaporates and dries the solvent contained in the ink applied on the substrate P. The control device 13 controls the turning on and off of the heater 17.

  The droplet discharge device IJ discharges ink onto the substrate P while relatively scanning the droplet discharge head 10 and the stage 14 supporting the substrate P. Here, in the following description, the X-axis direction is a scanning direction, and the Y-axis direction orthogonal to the X-axis direction is a non-scanning direction. The discharge nozzles of the droplet discharge head 10 are provided side by side at regular intervals in the Y-axis direction, which is the non-scanning direction. 2 is disposed at right angles to the traveling direction of the substrate P, the angle of the droplet discharging head 10 is adjusted so as to intersect the traveling direction of the substrate P. It may be. In this way, the pitch between the nozzles can be adjusted by adjusting the angle of the droplet discharge head 10. Further, the distance between the substrate P and the nozzle surface may be arbitrarily adjusted.

FIG. 3 is a cross-sectional view for explaining the ink ejection operation by the droplet ejection head 10 described above.
The above-described droplet discharge head 10 adopts a piezo method, and the droplet discharge by this piezo method has an advantage that it does not affect the composition of the ink because heat is not applied to the ink. . Specifically, the droplet discharge head 10 is provided with a piezo element 22 adjacent to the liquid chamber 21 containing the ink i. Ink is supplied to the liquid chamber 21 via an ink supply system 23 including a tank for storing ink.

  The piezo element 22 is connected to a drive circuit 24, and when a voltage is applied to the piezo element 22 via the drive circuit 24, the piezo element 22 is deformed and presses the liquid chamber 21, so that the ink i is ejected from the nozzle. 25 is discharged. In this case, the amount of distortion of the piezo element 22 is controlled by changing the voltage value to be applied. Further, the strain rate of the piezo element 22 is controlled by changing the frequency of the applied voltage.

Examples of the ink ejection technique include a charge control method, a pressure vibration method, an electromechanical conversion method, an electrothermal conversion method, and an electrostatic suction method.
Among these, the charge control method applies charge to ink with a charging electrode, and controls the flight direction of the ink with a deflection electrode to discharge the ink from the nozzle.
On the other hand, the pressure vibration method applies an ultra-high pressure of about 30 kg / cm ² to the ink and ejects the ink from the tip of the nozzle. When no control voltage is applied, the ink goes straight from the nozzle. When the control voltage is applied, electrostatic repulsion occurs between the inks, and the ink scatters and is not discharged from the nozzles.
On the other hand, as described above, the electromechanical conversion method uses the property that a piezo element (piezoelectric element) deforms in response to a pulsed electric signal, and the piezo element deforms into a space where ink is stored. Pressure is applied through a flexible material, ink is pushed out from this space, and ink is ejected from the nozzles.
On the other hand, in the electrothermal conversion method, a heater provided in a space in which ink is stored causes the ink to rapidly vaporize to generate bubbles, and the material in the space is ejected by the pressure of the bubbles. In the electrostatic suction method, a minute pressure is applied to a space in which ink is stored to form an ink meniscus in the nozzle, and an electrostatic attractive force is applied in this state before the ink is drawn out.
In addition, there are other techniques such as a system that uses a change in the viscosity of a fluid due to an electric field and a system that uses a discharge spark. The ink jet method has an advantage that the use of ink is less wasteful and a desired amount of ink can be accurately disposed at a desired position. The amount of one drop of ink (fluid) ejected by the ink jet method is, for example, 1 to 300 nanograms.

FIG. 4 is a cross-sectional view showing a manufacturing process of a color filter substrate to which the present invention is applied.
When producing a color filter substrate to which the present invention is applied, first, a bank 2 is formed on one surface of the substrate 1 as shown in FIG.

  As the substrate P, for example, those made of various materials such as glass, quartz glass, Si wafer, plastic, and metal plate can be used. Further, a base layer such as a semiconductor film, a metal film, a dielectric film, or an organic film may be formed on the surface of the substrate P made of these various materials. In particular, when the substrate P is an array substrate provided with pixel switching elements, wirings, etc., a color filter on array structure (COA structure) can be adopted.

  The bank 2 functions as a partition that partitions the dot formation regions 3 in which the color filters R, G, and B described above are arranged, and each dot is formed by the striped bank 2 formed on the substrate 1. The formation region 3 is partitioned in a grid pattern. That is, the dot formation area 3 partitioned by the bank 2 corresponds to each dot H in the color filter area C shown in the encircled portion in FIG. 1 described above, and ink is arranged in this dot formation area 3. As a result, the color filters R, G, and B can be arranged in each dot H. In addition, since the shape of each color filter R, G, B is prescribed | regulated by this bank 2, miniaturization of each color filter R, G, B is aimed at by narrowing the space | interval of the adjacent bank 2, for example. Can do.

  In the case of an electro-optical device such as a liquid crystal device, the bank 2 functions as a black matrix (BM) that prevents color mixture of light from adjacent color filters R, G, and B. In the liquid crystal device, such a bank 2 shields light between the respective dot formation regions 3 so that the contrast in color display can be improved.

  In the color filter substrate to which the present invention is applied, a conductive one is used for such a bank 2. Specifically, for example, a conductive material containing carbon black can be used for the bank 2. As a method for forming the bank 2, for example, the bank 2 material is formed on the substrate 1 using various coating methods, CVD methods (chemical vapor deposition methods), and the like, and then patterned by etching or the like. Thus, the bank 2 having the shape can be formed. Note that the bank 2 may be formed by forming the bank 2 on a member different from the substrate 1 and then transferring the bank 2 onto the substrate P.

Further, the bank 2 may be subjected to a liquid repellent treatment or a lyophilic treatment as necessary. As the lyophilic treatment, plasma treatment using oxygen as a treatment gas (O 2 plasma treatment or the like), ultraviolet irradiation treatment in an oxygen atmosphere, or the like can be used. On the other hand, as the liquid repellent treatment, plasma treatment using a gas having a fluorine component (fluorine-containing gas) such as CF ₄ , SF ₆ , or CHF ₃ can be used. Further, instead of the liquid repellent treatment, the bank material itself may be filled with a liquid repellent component (fluorine group or the like) in advance. By continuously performing such lyophilic treatment or lyophobic treatment, the inside of the bank 2 can be made lyophilic and the surface of the bank 2 can be made lyophobic, thereby the dot formation region 3 inside the bank 2. It is possible to prevent ink from adhering to the upper surface of the bank 2 or the like by disposing the ink only on the surface.

Next, as shown in FIG. 4B, ink i corresponding to each of the color filters R, G, and B is arranged in the dot formation region 3 partitioned by the bank 2.
As a method of disposing the ink i in the dot formation region 3, it is preferable to use the ink jet method using the liquid ejection device IJ described above. This ink-jet method has the advantage that it consumes less ink than a coating technique such as spin coating, and can control the amount and position of ink placed on the substrate with high accuracy. Yes.

  Specifically, the substrate 1 is placed on the stage 14 of the liquid ejection apparatus IJ described above, and a plurality of nozzles provided on the droplet ejection head 10 are scanned while relatively scanning the droplet ejection head 10 and the stage 14. The ejected ink i is repeatedly applied in the dot formation region 3 partitioned by the bank 2. As a result, an ink containing an R (red) pigment, an ink containing a G (green) pigment, and an ink containing an B (blue) pigment are selectively applied to the dot formation region 3 on the substrate 1, respectively. Can be arranged.

  In the present invention, the ink i is obtained by dispersing a pigment g having polarity in a solvent. As such an ink i, for example, a pigment that has been previously charged with a surfactant and dispersed in a solvent, or used for forming a color filter by a micelle electrolysis method or an electrodeposition method, etc. For example, a charged pigment dispersed in a solvent can be used. In this embodiment, R (red), G (green), and B (blue) pigments g previously treated with a surfactant and charged positively (+) are each dispersed in a solvent. Ink i was used.

  The solvent of the ink i is not particularly limited as long as it can disperse the pigment having the polarity and does not cause aggregation. For example, water or alcohol such as methanol, ethanol, propanol, or butanol , Hydrocarbon compounds such as n-heptane, n-octane, decane, dodecane, tetradecane, toluene, xylene, cymene, durene, indene, dipentene, tetrahydronaphthalene, decahydronaphthalene, cyclohexylbenzene, ethylene glycol dimethyl ether, ethylene glycol Diethyl ether, ethylene glycol methyl ethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether, 1,2-dimethoxyethane , Bis (2-methoxyethyl) ether, p- ether compounds such as dioxane, propylene carbonate, .gamma.-butyrolactone, N- methyl-2-pyrrolidone, dimethylformamide, dimethyl sulfoxide, and cyclohexanone. Of these, water, alcohols, hydrocarbon compounds, and ether compounds are preferred in terms of pigment dispersibility and liquid stability, and ease of application to the ink jet method, and more preferably water, hydrocarbons. Examples of such compounds are listed.

  The surface tension of the ink i is preferably in the range of 0.02 N / m to 0.07 N / m. When the ink is ejected by the ink jet method, if the surface tension is less than 0.02 N / m, the wettability of the ink to the nozzle increases, and thus flight bending easily occurs. If the surface tension exceeds 0.07 N / m, the nozzle Since the shape of the meniscus at the tip is not stable, it becomes difficult to control the discharge amount and the discharge timing. In order to adjust the surface tension, a small amount of a surface tension regulator such as a fluorine-based, silicone-based, or non-ionic-based solvent may be added to the solvent within a range that does not significantly decrease the contact angle with the substrate 1. The nonionic surface tension adjusting agent improves the wettability of the ink i to the substrate 1, improves the leveling property of the film, and helps prevent the occurrence of fine irregularities in the film. The surface tension adjusting agent may contain an organic compound such as alcohol, ether, ester, and ketone, if necessary.

  The viscosity of the ink is preferably 1 mPa · s to 50 mPa · s. When the ink i is ejected as droplets using the inkjet method, if the viscosity is less than 1 mPa · s, the nozzle periphery is easily contaminated by the outflow of the ink i, and if the viscosity is greater than 50 mPa · s, The frequency of clogging of the nozzles increases, and it becomes difficult to smoothly discharge droplets.

  Next, as shown in FIG. 4C, a voltage is applied to the bank 2, and the bank 2 is charged to the opposite polarity to the pigment g, that is, minus (-). The application of a voltage to the bank 2 can be performed by providing an electrode terminal that is electrically connected to the bank 2 around the screen of the substrate 1. In the present invention, when the bank 2 is charged with a charge (-) having a polarity opposite to that of the pigment g, the pigment g charged to a polarity opposite to that of the bank 2 is attracted to the bank 2, thereby The pigment concentration is higher in the peripheral portion than in the central portion of the pixel formation region 3.

  Next, as shown in FIG. 4D, the ink i is dried from this state to form the color filter layer 4. That is, in the present invention, the ink i is dried to remove the solvent and the color filter layer 4 is cured while the pigment concentration is higher in the peripheral portion than in the central portion of the pixel formation region 3.

The drying process of the ink i can be performed by, for example, a normal hot plate for heating the substrate 1 or a heating process using an electric furnace. The treatment conditions are, for example, a heating temperature of 60 ° C. and a heating time of about 10 minutes.
This drying process can also be performed by lamp annealing. The light source used for lamp annealing is not particularly limited, but excimer lasers such as infrared lamps, xenon lamps, YAG lasers, argon lasers, carbon dioxide lasers, XeF, XeCl, XeBr, KrF, KrCl, ArF, ArCl, etc. It can be used as a light source.
In addition, although such heat processing or light processing is normally performed in air | atmosphere, it can also be performed in inert gas atmosphere, such as nitrogen, argon, and helium, as needed.

  When the solvent in the ink i evaporates by such a drying process, the volume of the formed color filter layer 4 decreases. In this case, the above-described droplet discharge process and drying process are repeated until the color filter layer 4 has a sufficient thickness. The color filter layer 4 as described above is formed for each of R (red), G (green), and B (blue) colors. The order in which the color filter layers 4 for each color are formed is not particularly limited, and may be performed in any order.

  Through the steps as described above, a color filter substrate to which the present invention is applied can be manufactured. According to the method for manufacturing a color filter substrate to which the present invention is applied, as shown in FIG. 5A, the thickness of the color filter layer 4 is thinner in the peripheral portion than in the central portion of the dot formation region 3, but charging When the pigment g is attracted to the bank 2, the pigment concentration in the color filter layer 4 is higher in the peripheral portion than in the central portion of the dot formation region 3.

  As described above, when the color filter layer 4 is thinner in the peripheral portion than in the central portion of the dot formation region 3, the color is lighter in the peripheral portion than in the central portion of the dot formation region 3. On the other hand, in the present invention, as shown in FIG. 5B, in order to eliminate the color distribution non-uniformity caused by the thickness of the color filter layer 4, the pigment concentration in the color filter layer 4 is changed to dots. The height is higher in the peripheral portion than in the central portion of the formation region 3. Thereby, the transmission luminance of the color filter layer 4 can be made uniform in the dot formation region 3.

(Color filter substrate)
Next, a color filter substrate to which the present invention is applied will be described.
The color filter substrate to which the present invention is applied is arranged in a bank 2 formed on the substrate 1 and a dot formation region 3 partitioned by the bank 2 as shown in FIGS. 5 (a) and 5 (b). And the color filter layer 4 is thinner in the peripheral portion than the central portion of the dot forming region 3, and the pigment concentration in the color filter layer 4 is lower than that in the central portion of the dot forming region 3. Is characterized by being higher in the periphery.

  According to this configuration, the transmission luminance of the color filter layer 4 can be made uniform in the dot formation region 3 partitioned by the bank 2 without making the thickness of the color filter layer 4 uniform. Such light exposure can be prevented and good color characteristics can be obtained.

  The arrangement of the color filters R, G, and B on the color filter substrate described above is, for example, a mosaic arrangement as shown in FIG. 6B in addition to the stripe arrangement as shown in FIG. Alternatively, a delta arrangement as shown in FIG.

(Electro-optical device)
Next, an electro-optical device to which the present invention is applied will be described.
FIG. 7 is an exploded perspective view of a liquid crystal device 100 as an example of an electro-optical device to which the present invention is applied.
The liquid crystal device 100 is an active matrix type color liquid crystal display device using a thin film transistor (TFT) as a pixel switching element, and includes the color filter substrate.

  Specifically, as shown in FIG. 7, the liquid crystal device 100 includes a TFT array substrate 101 and a counter substrate 102 that are arranged to face each other. The TFT array substrate 101 and the counter substrate 102 are bonded to each other by a sealing material provided in a rectangular frame shape at the peripheral portions of the surfaces facing each other, and a region (cell gap) surrounded by both the substrates 101 and 102 and the sealing material. The liquid crystal 103 which is an electro-optical material is enclosed (held) in the inside.

  On the outer surface side of the TFT array substrate 101 and the counter substrate 102, types of liquid crystal modes to be used, that is, TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, OCB (Optically Compensated Bend) mode, IPS (In Plain Switching) ) Mode, STN (Super Twisted Nematic) mode and other operation modes, and normally white mode / normally black mode, optical members 104 and 105 such as retardation plates and polarizing plates are arranged in a predetermined direction. ing. Further, an illumination device 106 such as a backlight unit is provided on the outer surface side of the optical member 104 provided on the TFT array substrate 101 side.

  In the liquid crystal device 100, a plurality of pixels 100a are formed in a matrix. Each of these pixels 100 a is provided with a pixel switching TFT 107, and a data line 108 for supplying a pixel signal is electrically connected to the source of the TFT 107. Pixel signals to be written to the data lines 108 may be supplied line-sequentially in this order, or may be supplied for each group of a plurality of adjacent data lines 108. Further, the scanning line 109 is electrically connected to the gate of the TFT 107, and the scanning signal is applied to the scanning line 109 in a pulse-sequential manner in this order at a predetermined timing.

  In addition, a pixel electrode 110 is disposed in each of the plurality of pixels 100 a, and these pixel electrodes 110 are electrically connected to the drain of the TFT 107. Then, by turning on the TFT 107 for a certain period, a pixel signal supplied from the data line 108 is written to each pixel electrode 110 at a predetermined timing, and a predetermined signal written to the liquid crystal 103 via the pixel electrode 110 is written. A level pixel signal is held for a certain period with the counter electrode 111 disposed on the counter substrate 102.

  In addition, red (R), green (G), and blue (B) color filters 112R, 112G, and 112B are periodically arranged in the pixel 100a. When a voltage is applied to the liquid crystal layer 103, light transmitted through the liquid crystal layer 103 is output as colored light corresponding to the color filters 112R, 112G, and 112B.

  In this liquid crystal device 100, the TFT array substrate 101 is manufactured by applying the above-described method for manufacturing a color filter substrate of the present invention. That is, in manufacturing the TFT array substrate 101, a conductive bank (black matrix) that partitions the pixels 100a on the TFT array substrate 101 on which the TFT 107, the data line 108, the scanning line 109, etc. are formed. Form. Then, an ink containing a pigment having a polarity is arranged in a region partitioned by the bank, and the ink is dried in a state where a voltage is applied to the bank to charge the bank to a polarity opposite to that of the pigment. The color filters 112R, 112G, and 112B described above are formed.

  In this case, the thickness of each color filter 112R, 112G, 112B is thinner in the peripheral part than in the central part of the region, but the pigment is attracted to the charged bank, so that the color filter 112R, 112G, 112B has a thickness. The pigment concentration is higher in the peripheral part than in the central part of the region.

  Thereby, the transmission luminance of each of the color filters 112R, 112G, and 112B can be made uniform within each pixel 100a. Therefore, the liquid crystal device 100 including such a TFT array substrate 101 can perform high-quality color display with excellent color characteristics.

  The liquid crystal device 100 includes the TFT 107 as a switching element. However, the liquid crystal device includes a thin film diode (TFD) as a switching element, or a passive matrix liquid crystal device. The present invention can also be applied to.

  In the liquid crystal device 100, 112R, 112G, and 112B are arranged on the TFT array substrate 101 side, but color filters 112R, 112G, and 112B are arranged on the counter substrate 102 side. Also good. Also in this case, if the counter substrate 102 is manufactured by applying the method for manufacturing a color filter substrate of the present invention, a high-quality liquid crystal device 100 having excellent color characteristics can be obtained.

(Electronics)
Next, an electronic apparatus to which the present invention is applied will be described.
FIG. 8 is a perspective view of a mobile phone 1000 shown as an example of an electronic apparatus to which the present invention is applied.
A mobile phone 1000 illustrated in FIG. 8 includes a display portion 1001, a plurality of operation buttons 1002, a mouthpiece 1003, and a mouthpiece 1004. The display portion 1001 includes the liquid crystal device 100 described above. Yes. Therefore, the cellular phone 1000 including the liquid crystal device 100 can perform high-quality color display with excellent color characteristics in the display portion 1001.

  Note that the electronic apparatus to which the present invention is applied is not limited to such a cellular phone 1000. For example, an electronic book, a personal computer, a digital still camera, a liquid crystal television, a viewfinder type or a monitor direct view type video tape recorder, a car Examples include a navigation device, a pager, an electronic notebook, a calculator, a word processor, a workstation, a video phone, a POS terminal, and a device equipped with a touch panel. That is, the present invention can be widely applied to electronic devices including image display means, and any electronic device can perform high-quality color display with excellent color characteristics.

  The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention, and the specific materials and configurations described in the embodiment. These are merely examples, and can be changed as appropriate.

It is a perspective view which shows an example of the color filter board | substrate produced by applying this invention. It is a perspective view which shows a droplet discharge device. FIG. 6 is a cross-sectional view for explaining an ink ejection operation by a droplet ejection head. It is sectional drawing which shows the manufacturing process of the color filter substrate to which this invention is applied. 5A and 5B show a color filter substrate of the present invention, in which FIG. 5A is a sectional view thereof and FIG. 5B is a plan view thereof. FIG. 6 is a plan view showing an example of the arrangement of color filters. FIG. 7 is a perspective view showing an example of a display device to which the present invention is applied. FIG. 8 is a perspective view showing an example of an electronic apparatus to which the present invention is applied. 9A and 9B show a conventional color filter substrate, in which FIG. 9A is a sectional view thereof and FIG. 9B is a plan view thereof.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Substrate 2 ... Bank (partition wall) 3 ... Dot formation area 4 ... Color filter layer 100 ... Liquid crystal device (electro-optical device) 101 ... TFT array substrate (color filter substrate) 112R, 112G, 112B ... Color filter 1000 ... Mobile phone (Electronics)

Claims (3)

Forming a conductive partition on the substrate;
Placing an ink containing a pigment charged to one polarity in a region partitioned by the partition;
Applying a voltage to the partition to charge the partition to a polarity opposite to the pigment;
By Rukoto drying the ink, thinner at the peripheral portion than the central portion of the thickness of the region, and a step of the pigment concentration to form a color filter layer to be higher at the peripheral portion than at the central portion of the region A method for producing a color filter substrate, comprising:   An electro-optical device comprising a color filter substrate manufactured by the manufacturing method according to claim 1.   An electronic apparatus comprising the electro-optical device according to claim 2.

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