TWI571449B - Color filter with glass plate - Google Patents

Description

Glass plate for color filters

The present invention relates to a method for producing a glass plate for a color filter, a method for producing a color filter panel, and a glass substrate for a display.

Previously, in the manufacturing step of the glass plate, the step of washing the surface of the glass plate was carried out after the step of forming the glass plate from the glass raw material by a down draw method or the like. In the cleaning step of the glass plate, as disclosed in the patent document 1 (Japanese Laid-Open Patent Publication No. 2001-276759), in order to remove foreign matter such as fine pieces of glass, dust, and dirt adhering to the surface of the glass plate, acid utilization is performed. Or the treatment of the surface of the glass plate with an alkaline liquid or ultrasonic.

Further, a glass plate used in the manufacture of a flat panel display such as a liquid crystal display or a plasma display is a wavelength selective element in which a black matrix is disposed on the surface and light of red (R), green (G), and blue (B) is transmitted. That is, RGB pixels, thereby forming a color filter. The black matrix blocks light leakage from backlights other than the RGB pixel area and prevents color mixture of adjacent RGB pixels, thereby improving display contrast. That is, the light passing region in the color filter is determined by the shape and arrangement of the black matrix.

In recent years, with the high definition of the display, the line width and pitch of the black matrix disposed on the surface of the glass plate are reduced. Specifically, in order to achieve high contrast of the display, it is necessary to increase the aperture ratio by the high definition of the black matrix (specifically, the line width of less than 20 μm), and to improve the light blocking property by the high dimensional accuracy of the black matrix. Moreover, in order to achieve higher definition of the display, it is necessary to have a high definition of the black matrix.

Conventionally, in the manufacturing process of a flat panel display, by changing the heating conditions and exposure conditions of the black matrix resin, a black matrix can be disposed regardless of the surface state of the glass plate. However, with the necessity of high definition of the black matrix and high dimensional accuracy, it is necessary to achieve high adhesion of the black matrix resin to the surface of the glass plate with higher precision.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2001-276759

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2001-181686

However, the surface of the glass plate used in the manufacture of the flat panel display is required to have high cleanliness. Therefore, in order to remove the foreign matter adhering to the surface of the glass plate, as disclosed in the patent document 2 (Japanese Patent Laid-Open Publication No. 2001-181686), a method of cleaning the surface of the glass plate using an inorganic base-based cleaning agent can be applied. However, in such a cleaning method, there is a possibility that the high-adhesion property of the black matrix resin to the surface of the glass plate cannot be sufficiently achieved due to the organic matter remaining on the surface of the glass plate after the cleaning.

The present invention provides a method for producing a glass plate for a color filter which improves the adhesion of a resin to a surface, a method for producing a color filter panel, and a glass substrate for a display.

The method for producing a glass plate for a color filter in which a black matrix resin is formed on the surface of the present invention includes a glass plate manufacturing step and a glass plate cleaning step. In the glass sheet manufacturing step, a glass ribbon is formed from molten glass, and the glass ribbon is cut to form a glass sheet. In the glass plate cleaning step, the surface of the glass plate is cleaned to remove foreign matter adhering to the surface. The glass plate cleaning step includes a first cleaning step and a second cleaning step. In the first washing step, the surface is washed with an inorganic base-based cleaning agent to which a surfactant is added. In the second cleaning step, the surface is washed using tetramethylammonium hydroxide (TMAH) having a concentration of 0.1% to 2.38%. In the glass plate cleaning step, the glass plate is washed so that the mass of the organic substance present on the surface is 8 ng or less per 1 cm ^{2 of the} surface. Further, the surface of the glass sheet is kept in a wet state from the end of the first washing step to the start of the second washing step. Thereby, the amount of adhesion of the organic substance on the surface of the glass substrate after the second cleaning step can be controlled.

In the method for producing a glass plate for a color filter according to the present invention, the glass plate produced by the down-draw method or the floating method is first subjected to a first cleaning step of cleaning the surface with an inorganic base-based cleaning agent, and secondly, hydrogen is used. The second cleaning step of the surface cleaning of tetramethylammonium oxide (TMAH). TMAH has an effect of removing organic substances which are the cause of the adhesion of the black matrix resin to the surface of the glass sheet from the surface of the glass sheet. Further, by performing the second washing step after performing the first washing step, even if the organic substance derived from the surfactant contained in the inorganic base-based cleaning agent adheres to the surface of the glass sheet in the first washing step, In the second cleaning step, the organic matter may also be removed from the surface of the glass plate. In other words, in the method for producing a glass plate for a color filter, the organic material which causes the adhesion of the black matrix resin to the surface of the glass plate can be effectively removed from the surface of the glass plate by the second cleaning step. Therefore, the method for producing a glass plate for a color filter of the present invention can improve the adhesion of the resin to the surface of the glass plate.

Further, a surfactant-based ion-based surfactant is preferred, and the ion-based surfactant adhering to the surface of the glass plate is removed in the second cleaning step. In this case, in the first washing step, the ion-based surfactant adheres to the surface of the glass plate. Further, the surface of the glass plate after the second cleaning step has a smaller amount of adhesion of the ion-based surfactant than the surface of the glass plate after the first cleaning step. In other words, in the second cleaning step, the adhesion amount of the ion-based surfactant on the surface of the glass plate after the second cleaning step is controlled.

Further, in the glass plate washing step, it is preferred to clean the glass plate so that the mass of the hydrophobic organic substance is 0.01 ng to 0.25 ng per 1 cm ^{2 of the} surface. The hydrophobic organic substance is an organic substance which has a retention time of 18 minutes or more in GC/MS (Gas Chromatography/Mass Spectrometry) in an organic substance on the surface of a glass plate. Further, the hydrophobic organic compound is an aromatic compound. An aromatic compound which is an organic substance having a benzene ring is contained in a hydrophobic organic substance which adheres to the organic substance on the surface of the glass plate and has a retention time of 18 minutes or more in GC/MS. The aromatic compound is an organic substance which causes a decrease in the adhesion of the black matrix resin to the surface of the glass plate.

Further, in the glass plate cleaning step, it is preferred to clean the glass plate so that the mass of the hydrophobic organic substance present on the surface is 0.01 ng to 0.15 ng per 1 cm ^{2 of the} surface. A hydrophobic organic substance is an organic substance having a higher hydrophobicity than a glass plate. In other words, the hydrophobic organic substance is an organic substance having a lower affinity for water than a glass plate.

Further, it is preferred that the surface of the glass plate has a surface roughness Ra of less than 0.7 nm. The surface roughness Ra is a "center line average roughness" which is one of the parameters of the roughness of the surface of the glass plate. When the surface roughness Ra of the glass plate is less than 0.7 nm, the adhesion of the black matrix resin to the surface of the glass plate is not affected.

A method of manufacturing a color filter panel in which a resin film is formed on a surface of a glass substrate of the present invention includes a first cleaning step, a second cleaning step, and a resin film forming step. In the first cleaning step, the surface on which the resin film is formed is washed using an inorganic base-based cleaning agent containing a surfactant. In the second cleaning step, the surface on which the resin film is formed is washed using tetramethylammonium hydroxide having a concentration of 0.1% to 2.38%. In the resin film forming step, the adhesion amount of the organic substance in the surface is 8 ng or less per 1 cm ² , and the adhesion amount in the surface of the hydrophobic organic substance in the GC/MS is 18 minutes or more per 1 cm ^{2 .} A resin film is formed on the surface of 0.25 ng or less. Further, the surface of the glass substrate is kept in a wet state from the end of the first cleaning step to the start of the second cleaning step. Thereby, the amount of adhesion of the organic substance on the surface of the glass substrate after the second cleaning step can be controlled. Further, in the resin film forming step, the resin film is preferably a black matrix, and the black matrix is patterned with a line width of 3 μm to 15 μm.

In the method for producing a color filter panel of the present invention, for the above reasons, an organic substance which is a cause of reducing the adhesion of the black matrix resin to the surface of the glass sheet can be used. The surface of the board is effectively removed. Therefore, the method of manufacturing the color filter panel of the present invention can improve the adhesion of the resin to the surface of the color filter panel.

The adhesion amount of the organic substance on the surface of the glass substrate for a display of the present invention is 8 ng or less per 1 cm ² , and the adhesion amount of the aromatic compound on the surface is 0.25 ng or less per 1 cm ² .

In the glass substrate for a display of the present invention, since the amount of adhesion of the aromatic compound to the surface which is a cause of lowering the adhesion of the black matrix resin to the surface is small, the adhesion of the resin to the surface of the glass substrate is high.

The method for producing a glass plate for a color filter of the present invention can improve the adhesion of the resin to the surface of the glass plate.

Further, the method of manufacturing a color filter panel of the present invention can improve the adhesion of the resin to the surface of the color filter panel.

Further, the glass substrate for a display of the present invention can improve the adhesion of the resin to the surface of the glass substrate.

1‧‧‧One-piece cleaning device

10‧‧‧1st cleaning unit

12‧‧‧ brush unit

12a‧‧‧Washing brush roller

12b‧‧‧Washing brush roller

14‧‧‧Sponge unit

14a‧‧‧Clean sponge roller

14b‧‧‧Clean sponge roller

16‧‧‧Spray unit

18‧‧‧cleaning agent box

18a‧‧‧Nozzles

18b‧‧‧Nozzles

18c‧‧‧ nozzle

18d‧‧‧ nozzle

19‧‧‧ pure water tank

19a‧‧‧Nozzles

19b‧‧‧Nozzles

20‧‧‧2nd cleaning unit

101‧‧‧ batch cleaning device

120‧‧‧ box

130‧‧‧ liquid tank

G‧‧‧glass plate

L‧‧‧Liquid

Fig. 1 is a flow chart showing a method of manufacturing a glass sheet of the embodiment.

Figure 2 is a schematic view of a one-piece cleaning apparatus.

Fig. 3 is a plan view of the first cleaning unit.

Figure 4 is a side view of the first cleaning unit.

Figure 5 is a schematic view of a batch cleaning apparatus.

(1) Composition of glass plates

A method of producing a glass sheet for a color filter of the present invention will be described based on an embodiment. The glass plate for color filters manufactured in this embodiment is a glass plate used for manufacture of a flat panel display (FPD) such as a liquid crystal display. The glass The glass plate forms a color filter by arranging a black matrix on the surface and RGB pixels which are wavelength selection elements that transmit light of red (R), green (G), and blue (B). The black matrix blocks light leakage from backlights other than the RGB pixel area and prevents color mixture of adjacent RGB pixels, thereby improving display contrast. That is, the light passing region in the color filter is determined by the shape and arrangement of the black matrix. The thickness of the glass plate is, for example, 0.1 mm to 0.7 mm. The size of the glass plate is, for example, 680 mm × 880 mm (G4 size), 2200 mm × 2500 mm (G8 size).

The glass plate used in the manufacture of the FPD is preferably an alkali-free glass or a slightly alkali glass. When the glass plate is an alkali-free glass, the composition of the glass is, for example, SiO ₂ : 50% by mass to 70% by mass, Al ₂ O ₃ : 0% by mass to 25% by mass, and B ₂ O ₃ : 1% by mass to 15% Mass%, MgO: 0% by mass to 10% by mass, CaO: 0% by mass to 20% by mass, SrO: 0% by mass to 20% by mass, and BaO: 0% by mass to 10% by mass. Here, the total content of MgO, CaO, SrO, and BaO is 5% by mass to 30% by mass.

When the glass plate is a micro alkali glass containing a trace amount of an alkali metal, the composition of the glass further includes 0.1% by mass to 0.5% by mass of R' ₂ O, preferably 0.2% by mass to 0.5% by mass of R' ₂ O. . Here, R' is at least one selected from the group consisting of Li, Na, and K. Further, the total content of R' ₂ O may be less than 0.1% by mass.

Further, the glass plate may further contain SnO ₂ : 0.01% by mass to 1% by mass (preferably 0.01% by mass to 0.5% by mass), and Fe ₂ O ₃ : 0% by mass to 0.2% by mass in addition to the above components ( It is preferably 0.01% by mass to 0.08% by mass), and substantially does not contain As ₂ O ₃ , Sb ₂ O ₃ and PbO in consideration of environmental load.

(2) Process of manufacturing method of glass plate

Fig. 1 is a flow chart showing the flow of a method of manufacturing a glass sheet. Hereinafter, each of the steps S1 to S10 of the flowchart will be described.

First, in step S1, molten glass is produced by heating a glass raw material adjusted to produce a glass plate having the above composition, and is pulled down by a down-draw method. A glass ribbon having a specific thickness is continuously formed from molten glass or preformed glass by a method or a float method. In step S2, the glass ribbon produced in step S1 is cut to obtain a blank glass having a specific size. In step S3, the blank glass obtained in step S2 is placed on a pallet for transporting and storing the blank glass in the form of a laminate which is formed by laminating the spacer paper for protecting the surface of the blank glass.

Next, in step S4, the blank glass is taken out from the laminated body of the blank glass, and the blank glass is cut into the size of the glass plate as a product. In step S5, the glass sheet obtained in step S4 is subjected to end surface processing such as grinding, polishing, and etching of the end surface.

Next, the glass plate is cleaned in step S6. In the cleaning step of the glass plate, the fine particles of the glass adhering to the surface of the glass plate, that is, glass swarf, dust, dirt, adhesive foreign matter, and the like are removed. Further, in the cleaning step of the glass plate, an inorganic base-based cleaning agent containing a surfactant is used so that the foreign matter does not adhere to the surface of the glass plate after cleaning.

Then, in step S7, optical inspection of the glass plate washed in step S6 is performed. Specifically, it is examined whether or not a scratch having an optical defect is formed on the surface of the glass plate, and whether or not dust or dirt adheres to the surface of the glass plate. In step S8, the glass sheets which have passed the inspection in step S7 are placed on the pallet in the form of a laminate which is alternately laminated with the spacer paper for protecting the surface of the glass sheet, and are bundled and packaged. In step S9, the laminated body of the bundled glass plate is shipped to a manufacturer such as a FPD. Regarding the spacer paper sandwiched by the laminated body of the glass plate to be shipped, a pulp paper containing no recycled paper can be used from the viewpoint of preventing foreign matter originating from the spacer from adhering to the surface of the glass plate.

Moreover, the laminated body of the blank glass placed on the pallet in step S3 may be stored for several weeks or several months in step S10. In this case, from the viewpoint of cost and environmental protection, the paper which is sandwiched between the stacked sheets of the preserved blank glass is recycled paper. The laminated system of the blank glass that has been stored for a long time is as described above. The cutting step of step S4 is to the binding packaging step of step S8, and is shipped in step S9. Further, the laminate of the glass sheets placed on the pallet and packed in the step S8 may be stored for several weeks or months in the step S10. In this case, recycled paper can also be used as the spacer paper sandwiched between the laminated bodies of the glass sheets.

(3) Process of cleaning steps of glass plates

Next, the cleaning step of the glass plate performed in the step S6 of Fig. 1 will be described in detail. The washing step of the glass plate includes a first washing step and a second washing step. In the first washing step, the surface of the glass plate is washed using an inorganic base-based cleaning agent to which a surfactant is added. In the second washing step, the surface of the glass plate was washed with tetramethylammonium hydroxide (TMAH).

The inorganic base-based cleaning agent used in the first washing step is produced by adding an alkali component to a diluted solution obtained by diluting a commercially available cleaning solution for a glass plate with water. As the cleaning liquid for a glass plate, for example, a PK-LCG series manufactured by Parker Corporation, or a Semiclean series manufactured by Yokohama Oil & Fats Co., Ltd., or the like is used. The glass plate cleaning liquid is diluted, for example, with water to a concentration of 1% by weight to 5% by weight. The concentration of the alkali component of the diluent is converted to a concentration of potassium hydroxide (KOH), for example, from 0.02% by weight to 0.15% by weight.

In order to keep the surface of the glass plate clean, the water for diluting the cleaning agent is preferably subjected to ion exchange treatment, EDI (Electrodeionization) treatment, and reverse osmosis membrane (RO (Reverse Osmosis) membrane). The filtration treatment and the pure water or ultrapure water treated by decarbonation of the decarbonation device. Further, in order to remove the soluble organic matter, it is preferred to carry out the treatment of passing water through the activated carbon. Specifically, it is preferable to use a filter to remove foreign matter such as fine particles from water, and secondly, to remove organic matter by passing the activated carbon, and then perform ion exchange treatment, EDI treatment, filtration treatment using a reverse osmosis membrane, and decarbonation. Decarbonation treatment of the device.

In the ion exchange treatment, an ionic substance such as chloride ion or sodium ion contained in the water is removed from the water using an ion exchange resin membrane. In the EDI process, use ions The resin film is exchanged, and the potential gradient formed by applying a potential to the electrode is used to remove the ionic substance from the water with high precision. In the filtration treatment using a reverse osmosis membrane, ionic substances, salts and organic substances are removed from the water. In the decarbonation treatment, carbon dioxide is removed from the water using a decarbonation device.

In the present embodiment, a diluent selected from the group consisting of KOH, NaOH, ETDA-4Na, ETDA-4K, Na ₄ P ₂ O ₇ and K ₄ P ₂ O ₇ is added to the diluted solution of the cleaning liquid for glass plates. One or more kinds of alkali components are used to form a cleaning agent used in the first washing step. The concentration of the alkali component of the cleaning agent is converted to a concentration of potassium hydroxide (KOH) of 1% by weight or more. The alkali component is more etchable to glass than the other alkali components, and is excellent in solubility. In particular, from the viewpoints of etchability, solubility, and prevention of adverse effects on the thin film transistor formed on the glass plate, it is preferred to use KOH alone as an alkali component. Further, KOH and NaOH are advantageous in terms of drainage treatment as compared with other alkali components.

Further, in the cleaning agent used in the first cleaning step, the higher the concentration of the alkali component, the stronger the cleaning power for removing foreign matter from the glass plate. However, if the concentration of the alkali component is too high, there is a problem that the glass plate cleaning device is corroded and crystals are formed in the cleaning agent. Therefore, the concentration of the alkali component of the cleaning agent is preferably not more than 10% by weight. Further, in order to easily carry out the treatment of the cleaning agent, the concentration of the alkali component of the cleaning agent is more preferably not more than 5% by weight.

In the present embodiment, the glass sheet cleaning method includes two types of cleaning methods: single-chip cleaning and batch cleaning. First, a cleaning method of a glass plate by single-chip cleaning will be described. Fig. 2 is a schematic view of a one-chip cleaning apparatus 1 for performing a single-piece cleaning of a glass sheet G. The one-chip cleaning apparatus 1 includes a first cleaning unit 10 that performs a first cleaning step and a second cleaning unit 20 that performs a second cleaning step. The glass plate G is first cleaned in the first cleaning unit 10 with a detergent containing an inorganic base added with a surfactant, and secondly, washed in the second cleaning unit 20 by TMAH.

3 is a plan view of the first cleaning unit 10, and FIG. 4 is a side view of the first cleaning unit 10. In FIGS. 3 and 4, the conveying device for conveying the glass sheet G is omitted. Again, due to the The configuration of the cleaning unit 20 is substantially the same as the configuration of the first cleaning unit 10. Therefore, only the configuration of the first cleaning unit 10 will be described below. Different aspects of the first cleaning unit 10 and the second cleaning unit 20 will be described below.

The first cleaning unit 10 includes a brush unit 12, a sponge unit 14, and a shower unit 16 as shown in FIG. These units are arranged in order from the upstream side to the downstream side in the conveying direction of the glass sheet G. As shown in FIG. 4, the first cleaning unit 10 further includes a detergent tank 18, a pure water tank 19, and nozzles 18a, 18b, 18c, 18d, 19a, and 19b.

The brush unit 12 has cleaning brush rollers 12a, 12b. The cleaning brush rollers 12a and 12b are disposed along the conveying direction of the glass sheet G. The cleaning brush rolls 12a and 12b are disposed one above the glass sheet G so that the two surfaces of the glass sheet G to be conveyed can be cleaned. The cleaning brush rollers 12a and 12b are disposed so as to traverse the conveying direction of the glass sheet G, respectively. A plurality of cleaning brushes are attached to the outer peripheral surface of the cleaning brush rollers 12a and 12b. The surface of the glass plate G is cleaned by the rotation of the washing brush rolls 12a and 12b to bring the cleaning brush into contact with the surface of the conveyed glass sheet G. In FIG. 3, the cleaning brush rolls 12a and 12b are arranged in two rows along the conveying direction of the glass sheet G, but they may be arranged in only one row or three rows or more.

The sponge unit 14 has cleaning sponge rolls 14a, 14b. The cleaning sponge rolls 14a and 14b are arranged along the conveying direction of the glass sheet G. The cleaning sponge rolls 14a and 14b are disposed one above the glass sheet G so that the two surfaces of the glass sheet G to be conveyed can be cleaned. The cleaning sponge rolls 14a and 14b are disposed so as to traverse the conveying direction of the glass sheet G, respectively. A cleaning sponge is attached to the outer peripheral surface of the cleaning sponge rolls 14a and 14b. The surface of the glass plate G is cleaned by contacting the shafts of the cleaning sponge rolls 14a and 14b so that the cleaning sponge contacts the surface of the glass plate G to be conveyed. In FIG. 3, the cleaning sponge rolls 14a and 14b are arranged in two rows along the conveying direction of the glass sheet G, but they may be arranged in only one row or three rows or more.

The detergent tank 18 of the first cleaning unit 10 stores the inorganic base-based cleaning agent to which the surfactant is added, which is used in the first cleaning step. The detergent tank 18 has, for example, a cleaning agent Heat to a temperature range of 50 ° C ~ 80 ° C and perform the function of heat preservation. The nozzles 18a and 18b spray the cleaning agent supplied from the cleaning agent tank 18 onto both surfaces of the glass sheet G conveyed in the brush unit 12. The nozzles 18c and 18d spray the cleaning agent supplied from the cleaning agent tank 18 onto both surfaces of the glass sheet G conveyed in the sponge unit 14.

The pure water tank 19 stores the above pure water or ultrapure water. The nozzles 19a and 19b spray pure water or ultrapure water supplied from the pure water tank 19 to both surfaces of the glass sheet G conveyed in the shower unit 16.

The second cleaning unit 20 has the same configuration as the first cleaning unit 10. However, the detergent tank 18 of the second cleaning unit 20 stores the TMAH used in the second cleaning step. The concentration of TMAH is from 0.1% to 2.38%, but is preferably from 0.25% to 1.5%, more preferably from 0.35% to 1.0%.

Further, in the present embodiment, as shown in FIG. 4, the brush unit 12 and the sponge unit 14 use the common detergent tank 18, but the respective detergent tanks 18 may be used. In this case, the brush unit 12 and the sponge unit 14 can also clean the glass sheet G with different concentrations of the cleaning agent.

Next, the cleaning process of the glass sheet G in the one-piece cleaning apparatus 1 will be described. First, the brush cleaning of the glass plate G is performed in the brush unit 12 of the first cleaning unit 10. Specifically, the inorganic alkali-based cleaning agent sprayed from the nozzles 18a and 18b adheres to both surfaces of the glass sheet G, and both surfaces of the glass sheet G are cleaned by the rotation of the cleaning brush rolls 12a and 12b.

Next, the sponge cleaning of the glass plate G is performed in the sponge unit 14 of the first cleaning unit 10. Specifically, the inorganic alkali-based cleaning agent sprayed from the nozzles 18c and 18d adheres to both surfaces of the glass sheet G, and both surfaces of the glass sheet G are cleaned by the shaft rotation of the cleaning sponge rolls 14a and 14b.

Then, in the shower unit 16 of the first cleaning unit 10, the inorganic base-based cleaning agent adhering to the surface of the glass sheet G is removed. Specifically, pure water or ultrapure water sprayed from the nozzles 19a, 19b is attached to both surfaces of the glass sheet G, thereby washing the glass with pure water or ultrapure water. The surface of the glass plate G is washed away from the inorganic base-based cleaning agent attached to the surface. Further, pure water or ultrapure water has adhered to the surface of the glass sheet G of the shower unit 16 to be in a wet state. The glass sheet G of the first cleaning unit 10 is conveyed to the inside of the second cleaning unit 20 while the surface is wet. Thereby, the amount of adhesion of foreign matter on the surface of the glass sheet G that has passed through the second cleaning unit 20 can be controlled.

Then, the brush cleaning of the glass plate G is performed in the brush unit 12 of the second cleaning unit 20. Specifically, TMAH sprayed from the nozzles 18a and 18b adheres to both surfaces of the glass sheet G, and both surfaces of the glass sheet G are cleaned by the shaft rotation of the cleaning brush rolls 12a and 12b.

Then, sponge cleaning of the glass plate G is performed in the sponge unit 14 of the second cleaning unit 20. Specifically, TMAH sprayed from the nozzles 18c and 18d adheres to both surfaces of the glass sheet G, and both surfaces of the glass sheet G are cleaned by the shaft rotation of the cleaning sponge rolls 14a and 14b.

Then, the TMAH attached to the surface of the glass sheet G is removed from the shower unit 16 of the second cleaning unit 20. Specifically, pure water or ultrapure water sprayed from the nozzles 19a, 19b is attached to both surfaces of the glass sheet G, whereby the surface of the glass sheet G is washed with pure water or ultrapure water, and the TMAH attached to the surface is washed away. .

The cleaning method of the glass plate by single-chip cleaning has been described above. Next, the cleaning method of the glass plate by batch cleaning will be described. Fig. 5 is a schematic view of a batch cleaning apparatus 101 for performing glass cleaning in batches. The batch cleaning device 101 includes a transport mechanism (not shown) that transports a cassette 120 that can accommodate a plurality of glass sheets G, and a plurality of liquid tanks 130. Each of the liquid tanks 130 includes an ultrasonic cleaning mechanism and a temperature adjusting mechanism. The ultrasonic cleaning mechanism cleans the glass sheet G by ultrasonic waves in a state where the glass sheet G is immersed in the liquid L, and the temperature adjusting mechanism adjusts the liquid L. temperature. The batch cleaning device 101 further includes a tank (not shown) for supplying the liquid L to each of the liquid tanks 130.

The cassette 120 in which a plurality of glass sheets G are accommodated is transported by a transport mechanism, and sequentially immersed in a plurality of liquids L stored in the liquid tank 130 for washing. Batch cleaning device In 101, the kind and order of the liquid L which immersed in the glass plate G are determined suitably. As an example of the batch cleaning step, there are a first step using hydrofluoric acid, a second step using pure water, a third step using an inorganic alkali-based cleaning agent, a fourth step using pure water, a fifth step using TMAH, and a sixth step using Pure water, step 7 uses ultrapure water to clean the glass plate G. The pure water used in the steps of the second, fourth, and sixth steps and the ultrapure water used in the step of the seventh step are the same as the pure water and the ultrapure water used in the above single-chip cleaning apparatus 1, respectively. The inorganic base-based cleaning agent used in the step of the third step is the same as the cleaning agent used in the above-described one-chip cleaning apparatus 1. The time during which the glass sheet G is immersed in the liquid L in each of the liquid tanks 130 is 45 seconds to 180 seconds depending on the liquid L. Further, the surface treatment of the glass plate G using fluoric acid as the step of the first step may not be performed.

(4) Features (4-1)

Previously, in order to remove the organic matter adhering to the surface of the glass plate, a method of cleaning the surface of the glass plate with an inorganic base-based cleaning agent was used. A semiconductor element such as a TFT is formed on the surface of the glass plate used in the manufacture of the FPD. In order to suppress the destruction of the semiconductor element due to peeling electrification or short circuit, etc., such a glass plate is required to have an extremely high degree of cleanliness. Therefore, a method is employed in which a glass plate having an extremely high degree of cleanliness is produced by washing the surface of the glass plate with an inorganic base-based cleaning agent.

However, it is understood that the glass plate after cleaning with a KOH or NaOH-based inorganic base-based cleaning agent for the purpose of high cleanliness has a problem that the black matrix resin has low adhesion to the surface, and thus the black matrix is on the surface of the glass plate. Stripped. In particular, in recent years, with the high definition of the display, the line width and pitch of the black matrix disposed on the surface of the glass plate are reduced, so that the adhesion of the black matrix resin to the surface of the glass plate is important. Therefore, the above-described glass plate cleaning method cannot cope with the high definition of the black matrix.

Further, the specific organic substance adhering to the surface of the glass plate may cause the adhesion of the black matrix resin to the surface of the glass plate to be lowered. Specifically, if you use the interface to add live When the inorganic base-based cleaning agent of the agent cleans the surface of the glass plate, the adhesion of the black matrix resin to the surface of the glass plate is lowered. Therefore, the organic substance derived from the surfactant may cause a decrease in the adhesion of the black matrix resin. Further, the organic substance which causes the adhesion of the black matrix resin to be reduced may include, for example, an organic substance derived from a spacer paper contained in the laminated body of the glass plate, and an organic substance in an atmosphere in a storage and conveyance environment of the glass plate laminate. .

In the present embodiment, after the first cleaning step of washing the surface of the glass plate with the inorganic base-based cleaning agent to which the surfactant is added, the second cleaning step of cleaning the surface of the glass plate with TMAH is performed. A glass plate having extremely high cleanliness and in which the adhesion of the black matrix resin is not lowered can be produced. In the second cleaning step, the surface of the glass plate is cleaned by using TMAH to remove the organic substance derived from the surfactant contained in the cleaning agent used in the first cleaning step, and the first cleaning step is performed. An organic matter that causes adhesion to the surface of the glass sheet. This organic substance is an organic substance which causes the adhesion of the black matrix resin to the surface of the glass plate to be lowered. The organic substance is a hydrophobic organic substance having a retention time of 18 minutes or longer in GC/MS, and is, for example, an aromatic compound. In other words, in the second cleaning step, the hydrophobic organic substance which causes the adhesion of the black matrix resin to the surface of the glass sheet is effectively removed from the surface of the glass sheet. Therefore, the method for producing a glass sheet of the present embodiment can improve the adhesion of the black matrix resin to the surface of the glass sheet. Further, a nonpolar column TC-1 manufactured by GL Science Co., Ltd. was used as a capillary column used in GC/MS.

In the present embodiment, the mass of the hydrophobic organic substance adhering to the surface of the glass plate after the washing step of the glass plate is preferably 0.05 ng to 0.50 ng, more preferably 0.05 ng to 0.25 per 1 cm ^{2 of the} surface of the glass plate. Ng.

Further, the method for producing a glass sheet of the present embodiment is particularly effective for the production of a color filter panel having a line width and a small pitch of a black matrix. The color filter panel is a glass plate in which a black matrix and RGB pixels are arranged on the surface to form a color filter. Using this embodiment The glass plate produced by the method for producing a glass plate can sufficiently suppress the peeling of the black matrix even if a black matrix having a line width of less than 10 μm is disposed on the surface. Therefore, the glass plate can be provided with a high-definition black matrix having a line width of 3 μm to 5 μm on the surface.

(4-2)

In the present embodiment, after the surface of the glass sheet G is cleaned by the inorganic alkali-based cleaning agent in the brush unit 12 and the sponge unit 14 of the first cleaning unit 10, the shower unit 16 in the first cleaning unit 10 is used. In the middle, the inorganic base-based cleaning agent attached to the surface of the glass sheet G is washed away by pure water or ultrapure water. Thereby, it is possible to suppress the deterioration of the cleaning effect of the glass sheet G using TMAH in the second cleaning step in the next cleaning step by the cleaning agent adhering to the surface of the glass sheet G in the first cleaning step.

The inorganic base-based cleaning agent used in the first washing step contains a surfactant. As described above, the surfactant is an organic substance which causes a decrease in the adhesion of the black matrix resin to the surface of the glass plate. Therefore, at the end of the first cleaning step, the surface of the glass plate G is washed with pure water or ultrapure water, and the cleaning agent adhering to the surface of the glass plate G is washed away, whereby the removal and adhesion in the second cleaning step can be improved. The effect of organic matter on the surface of the glass sheet G. The second cleaning step has an effect of removing foreign matter adhering to the surface of the glass sheet G and removing an organic substance derived from a cleaning agent adhering to the surface of the glass sheet G by performing the first cleaning step.

Further, at the end of the second cleaning step, the shower unit 16 of the second cleaning unit 20 also washes away the TMAH attached to the surface of the glass sheet G by pure water or ultrapure water. Therefore, the glass plate G cleaned by the one-piece cleaning device 1 or the batch cleaning device 101 has extremely high cleanliness.

(4-3)

In the present embodiment, the cleaning agent used in the first cleaning step is obtained by adding an alkali component such as KOH to a diluent obtained by diluting a commercially available cleaning liquid for a glass substrate with water. to make. Specifically, an alkali component such as KOH is added to the diluted solution of the cleaning liquid for a glass substrate to produce a cleaning agent having a concentration of 1% by weight or more. By adding an alkali component, it is possible to easily produce a cleaning agent having a high concentration of an alkali component without producing and treating a cleaning liquid having a very high concentration of an alkali component. The cleaning agent having a high concentration of the alkali component can improve the etching property of the glass plate, and can peel off foreign matter such as glass dust or dust and adhesive foreign matter adhering to the surface of the glass plate under load, and the like. Effectively removed.

Moreover, the surface tension of the cleaning agent produced by adding an alkali component to the dilution liquid of the glass substrate cleaning liquid is lower than the diluent. In other words, by adding an alkali component such as KOH to the diluted solution of the cleaning liquid for a glass substrate containing the surfactant, it is possible to reduce the surface tension of the cleaning agent which is hardly obtained when the alkali component is added to the pure water alone. effect. Thereby, the cleaning agent becomes easy to penetrate between the adhesive foreign matter and the glass plate. Further, by the synergistic effect of improving the etching property of the glass sheet by the cleaning agent, the foreign matter adhering to the glass plate can be removed more effectively.

Moreover, by increasing the concentration of the alkali component added to the diluted solution of the cleaning liquid for a glass substrate, the effect of removing the adhesive foreign matter adhering to the surface of the glass plate stored for a long period of several weeks or more can be improved.

(5) Embodiment

An embodiment of a method for producing a glass plate for a color filter of the present invention will be described. In the present embodiment, after the glass plate was cleaned, the surface of the glass plate was coated with a black matrix resin, and the adhesion of the black matrix resin to the surface of the glass plate was confirmed. Hereinafter, the specific order will be described.

First, according to the step S3 shown in Fig. 1 described above, a laminate in which the blank glass and the spacer paper are alternately laminated on the pallet is prepared. Next, according to the step S4, the blank glass is taken out from the laminated body of the blank glass, and the blank glass is cut into a specific size to obtain a glass plate. Next, the end surface processing of the glass sheet is performed in accordance with step S5. Then, according to step S6, the one-piece cleaning of the glass plate is performed using the one-chip cleaning device 1 described in the embodiment. wash. In the first washing step of the glass plate, a cleaning agent which is obtained by diluting KG which is an inorganic alkaline cleaning agent manufactured by Yokohama Oil & Fats Co., Ltd., and adding KOH as an alkali component is used. In the second cleaning step of the glass plate, TMAH having a concentration of 0.1% to 2.38% is used.

Next, a black matrix resin was coated on the surface of the glass plate. Specifically, a black matrix resin was applied to the surface of the glass plate so that the film thickness became 1 μm. Next, the glass plate coated with the black matrix resin was exposed and developed using a photomask having a pattern of 1 μm, 3 μm, 5 μm, 10 μm, 15 μm, 20 μm, and 30 μm, and the adhesion of the black matrix resin to the surface of the glass plate was determined. Specifically, the presence or absence of peeling of the black matrix on the surface of the glass plate and the residue were confirmed.

In the present embodiment, the black matrix resin applied to the surface of the glass plate showed no peeling or residue in the line width of 5 μm to 30 μm. Further, the residual amount of TMAH in the surface of the washed glass plate is limited to 0.01 ng/cm ² or less by ion chromatography.

In addition, in the first cleaning step of the glass plate, the black matrix resin pair is used even if the LGL which is an inorganic alkaline cleaning agent manufactured by Yokohama Oil & Fats Co., Ltd., which is an inorganic alkaline cleaning agent, is added with pure water, and the KOH which is an alkali component is added. The judgment result of the adhesion of the surface of the glass plate also does not change. Further, the surface roughness Ra of the glass plate is 0.15 nm to 0.67 nm.

Further, as a comparative example, in the first washing step of the glass plate, instead of using an inorganic base-based cleaning agent containing a surfactant, the glass plate was washed using TMAH. That is, in the first washing step and the second washing step, the glass plate using TMAH was cleaned. As a result, the amount of foreign matter adhering to the surface of the glass plate was larger than that of the above embodiment. The reason is considered to be that the cleaning power of TMAH is weaker than the inorganic base-based cleaning agent such as KG, and the dirt adhering to the blank glass cannot be completely removed. In the case of using this cleaning method, it was confirmed that the adhesion of the black matrix resin to the surface of the glass plate was considered to be due to peeling and residue of the black matrix to which foreign matter adhered.

Further, in the cleaning step of the glass plate in the above step S6 of Fig. 1, the glass is not subjected to glass An example of performing batch cleaning of a glass plate by single-chip cleaning of a glass plate will be described. In this case, the black matrix resin having a line width of 3 μm to 30 μm applied on the surface of the glass plate did not detect peeling and residue in any of the line widths.

Further, the pattern of the black matrix resin having a narrow line width was subjected to peeling of the black matrix and confirmation of the residue. First, in the second cleaning step of the glass plate, the glass plate was cleaned using TMAH at a concentration of 0.5%. Next, a black matrix resin was applied to the surface of the cleaned glass plate to have a film thickness of 1 μm and a line width of 1 μm to 15 μm to form a pattern, and the adhesion of the black matrix resin to the surface of the glass plate was determined. As a result, in the line width of 3 μm to 15 μm, peeling and residue of the black matrix on the surface of the glass plate were not confirmed. Further, in the line width of 1 μm, partial peeling of the black matrix was confirmed. However, the probability of occurrence of peeling or residue of the black matrix in the line width of 1 μm can be reduced. Therefore, the yield in the pattern of the black matrix resin having a particularly narrow line width can be improved as compared with the prior method in which the specific surface foreign matter is not controlled.

Further, as a comparative example, in the second cleaning step of the glass plate, instead of immersing the glass plate in TMAH for cleaning, the glass plate was immersed in aqueous ammonia to perform ultrasonic cleaning. As a result, the black matrix resin having a line width narrower than 20 μm applied to the surface of the glass plate confirmed the occurrence of peeling and residue even when the film formation conditions and development conditions of the black matrix were changed.

(6) Variations (6-1) Change A

The cleaning method of the present embodiment relates to a cleaning step of a glass plate obtained by singulating a glass ribbon, but may be applied to a cleaning step of a glass film stored in a roll shape. By using a down-draw method or a re-drawing method, a glass ribbon having a thickness of 0.1 mm or less formed by using molten glass or a preformed glass formed of molten glass is taken up by spacer film or resin film, whereby a roll-like shape can be obtained. Rough glass.

In this variation, the spacer paper or resin is removed from the roll-shaped blank glass. The film is slowly pulled out of the glass film. Then, after etching the end surface of the glass film, the surface of the glass film is cleaned. In the washing step of the glass film, the surface is washed with an inorganic base-based cleaning agent to which a surfactant is added, and the surface is washed with pure water or ultrapure water, and then the surface is cleaned with TMAH. Wash the surface again with pure or ultrapure water. Then, the washed glass film is conveyed to the manufacturing process of the color filter in a roll-to-roll manner. Alternatively, the cleaned glass film is again taken up by the spacer paper or the resin film for the article to form a glass film roll as a product.

(6-2) Change B

In the second embodiment, in the second cleaning step of the one-chip cleaning apparatus 1, the glass plate G is brush-cleaned and sponge-washed using TMAH, and then the glass plate G is sprayed with pure water or ultrapure water. The organic matter remaining on the surface of the glass plate G is removed by washing. However, in the second washing step, the sponge washing may not be performed. Specifically, at least one of brush cleaning and sponge cleaning may be appropriately performed in the second cleaning step in accordance with the foreign matter removing ability in the first washing step.

(6-3) Change C

In the present embodiment, in the second cleaning step in the one-chip cleaning apparatus 1, the glass sheet G subjected to the one-piece cleaning is sent to the inspection step of step S7 shown in FIG. However, the glass sheet G subjected to the one-piece cleaning can be further subjected to batch cleaning. In the batch cleaning, as shown in FIG. 5, a plurality of glass sheets G are housed in the case 120, and the glass sheets G are sequentially immersed in a plurality of liquid tanks 130 to be cleaned.

(6-4) Variation D

In the present embodiment, the surface of the glass plate preferably has a surface roughness Ra of less than 0.7 nm. The surface roughness Ra is a "center line average roughness" which is one of the parameters indicating the roughness of the surface of the glass plate. When the surface roughness Ra of the glass plate is less than 0.7 nm, the adhesion of the black matrix resin to the surface of the glass plate is not affected, and thus The adhesion of the black matrix resin on the surface of the glass plate can be more easily controlled.

10‧‧‧1st cleaning unit

12‧‧‧ brush unit

12a‧‧‧Washing brush roller

12b‧‧‧Washing brush roller

14‧‧‧Sponge unit

14a‧‧‧Clean sponge roller

14b‧‧‧Clean sponge roller

16‧‧‧Spray unit

18‧‧‧cleaning agent box

18a‧‧‧Nozzles

18b‧‧‧Nozzles

18c‧‧‧ nozzle

18d‧‧‧ nozzle

19‧‧‧ pure water tank

19a‧‧‧Nozzles

19b‧‧‧Nozzles

G‧‧‧glass plate

Claims (6)

A glass plate for a color filter, wherein a black matrix resin is formed on a surface after cleaning, wherein an adhesion amount of an aromatic compound which is a hydrophobic organic substance on the surface after the cleaning is 0.01 ng to 0.25 per 1 cm ² . Ng. The glass plate for a color filter of claim 1, wherein the amount of the organic substance in the surface is 8 ng or less per 1 cm ² . A glass plate for a color filter according to claim 1 or 2, which has a surface roughness Ra of less than 0.7 nm. A glass plate for a color filter according to claim 1 or 2, which is an alkali-free glass having SiO ₂ : 50% by mass to 70% by mass, Al ₂ O ₃ : 0% by mass to 25% by mass, and B ₂ O ₃ : 1% by mass to 15% by mass, MgO: 0% by mass to 10% by mass, CaO: 0% by mass to 20% by mass, SrO: 0% by mass to 20% by mass, BaO: 0% by mass to 10% by mass The composition thereof is a total content of MgO, CaO, SrO, and BaO of 5% by mass to 30% by mass. A glass plate for a color filter according to claim 1 or 2, which is a microalkali glass having SiO ₂ : 50% by mass to 70% by mass, Al ₂ O ₃ : 0% by mass to 25% by mass, B ₂ O ₃ : 1% by mass to 15% by mass, MgO: 0% by mass to 10% by mass, CaO: 0% by mass to 20% by mass, SrO: 0% by mass to 20% by mass, BaO: 0% by mass to 10% by mass And R' ₂ O: a composition of 0.1% by mass to 0.5% by mass, and a total content of MgO, CaO, SrO, and BaO is 5% by mass to 30% by mass, and R' is at least 1 selected from the group consisting of Li, Na, and K. Kind. A glass plate for a color filter according to claim 1 or 2, which has a thickness of 0.7 mm or less.