JPH0481717A - Manufacture of liquid crystal base plate and device for manufacturing the same - Google Patents

Abstract

PURPOSE:To smoothly advance the pressing of a resin for smoothing with a base plate for pressing without stopping nor speed reduction and to form a smooth layer which has no surface ruggedness by providing a mechanism which smoothly increases the pressing force. CONSTITUTION:When the resin 22 for smoothing is pressed, the flow rate of air suction to a pressing tank 2 is controlled to increase the pressure difference between a pressing tank 2 and the pressing tank 2 as the pressing force to the substrate 21 for pressing. After the pressing of a resin coating surface by the base plate 21 for pressing is smoothly advanced without stopping nor speed reduction, the smoothing resin 22 is cured by electron-beam or ultraviolet-ray irradiation and then the substrate 21 for pressing is separated. Consequently, a smooth resin phase which has no surface ruggedness can be formed.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a manufacturing method and manufacturing apparatus for a substrate used in a liquid crystal display element (a) Conventional technology To improve the display characteristics of a liquid crystal display element It is necessary to make the surface of the glass substrate or color filter substrate sufficiently smooth.

This (Friend) Due to the unevenness of the surface of the liquid crystal substrate, the distance between the two liquid crystal substrates that sandwich the liquid crystal becomes uneven, which leads to deterioration of display characteristics.When forming transparent electrodes, it is difficult to disconnect the transparent electrodes.Also, these This is because the unevenness of the surface scatters the light that passes through the panel, making it impossible to obtain uniform display characteristics (X, etc.).

Therefore, in the case of color filter substrates, the color filter is manufactured by applying electron beam curing or ultraviolet curing resin to the surface of the color filter substrate, pressing the resin-coated surface with a polished glass substrate, and transferring the polished surface of the polished glass to the resin surface. A smooth layer was formed on the surface of the substrate.An example of the above-mentioned conventional method for manufacturing a liquid crystal substrate will be explained below. This is a cross-sectional view of a color filter substrate and a manufacturing device for pressing. In FIG. 3, 30 is a color filter substrate, 20a,
20b and 20c are red, blue, and green color filters, respectively. Reference numeral 22 denotes a smoothing resin, which is applied onto the color filter substrate. Reference numeral 21 denotes a pressing substrate, which presses the surface to which the smoothing resin 22 is applied.

The pressing process is shown in FIG. In Figure 4,
Reference numeral 1 denotes a press tank, in which the color filter substrate 30 and the pressing substrate 21 are installed. 2 is a pressure tank, and 3 is a table. 4 and 6 are intake holes and exhaust holes for the press tank 2, and 5 and 7 are intake holes and exhaust holes for the press tank 1. 8 is a rubber sheet for pressing, 1
0 is a claw that supports the pressing substrate 21 An example of the method for manufacturing the liquid crystal substrate configured as described above will be described below. First, smoothing resin 22 is applied onto the color filter substrate 30. Set it on table 3. Next, the pressing substrate 21 is set on the claw 10. Next, after evacuating the press tank 2 and the press tank 2, air is taken in from the air intake hole 4 to the press tank I. By applying a pressure difference between the press tank 1 and the press tank 2, the rubber sheet 8 for pressing is pressed. The smoothing resin 22 is sequentially pressed by pressing the base plate 21. This unloading 1o is lowered one by one until it is below the top surface of the table. Although the substrate 21 is released from the mold and a smooth layer is formed on the color filter substrate 30, the problem to be solved by the invention is, however, with the above configuration (as shown in FIG. If the intake air inflow rate from the hole 4 is constant, the pressure difference between the two tanks, press tank 1 and press tank 2, which is the pressing force against the press board 21, will not increase smoothly, and therefore, as shown in FIG. 5(b). As shown in FIG. 6, the progress of pressing the smoothing resin 22 by the pressing substrate 21 is stopped or decelerated, and as shown in FIG.
A smoothing resin 2 is applied between
The non-uniformly stretched portion 4o of 2 has the problem that surface irregularities that can be seen with a visual inspection device applying the principle of a magic mirror as shown in FIG. In view of the above-mentioned problems, the present invention allows the pressing of the smoothing resin 22 by the pressing substrate 2I to proceed smoothly without stopping or slowing down. The present invention provides a method for manufacturing a liquid crystal substrate on which a resin layer can be formed.

Means for Solving the Problems In order to solve the above problems, the method for manufacturing a liquid crystal substrate of the present invention is as follows: When pressing the smoothing resin 22, by controlling the flow rate of air sucked into the pressing tank 2, By smoothly increasing the pressure difference between the two tanks, press tank 1 and press tank 2, which is the pressing force of The present invention has a configuration for forming a smooth layer on a liquid crystal substrate.The present invention has the above-described configuration, so that when pressing the smoothing resin 22, the pressing force increases smoothly, and the smoothing resin by the pressing substrate 21 By smoothly advancing the press of 22 without stopping or slowing down, it is possible to form a smooth layer with no surface irregularities as seen with a visual inspection device that applies the principle of a magic mirror. One embodiment will be described with reference to the drawings, and FIG. 1 shows one step of the method for manufacturing a liquid crystal substrate in the embodiment of the present invention. In FIG. It is divided into two tanks, a pressure tank 2 and a breath tank 1, by a rubber sheet 8. 3 is a table, and a color filter substrate 30 coated with a smoothing resin 22 is installed, and a pressure substrate 21 is held on top of the table by a nail 10. Further, reference numeral 15 denotes a flow rate control valve, which can control the amount of gas flowing into the pressure tank 2. First, a color filter substrate 30 coated with an ultraviolet curable smoothing resin 22 is set on the table 3, and the pressure tank 2 is evacuated, so that the rubber sheet 8 is expanded toward the pressure tank 2. When the pressure in the press tank 2 reaches 0.5 Torr, the exhaust of the press tank 2 is stopped, and then the press tank 1 is evacuated. At this time, due to the decrease in the pressure difference between the pressure tank 2 and the breath tank 1, the rubber sheet 8 that had swelled toward the pressure tank 2 side swells toward the breath tank 1 side.
Stop exhausting the breath tank 1 when the atmospheric pressure is 1.0 Torr.
The flow control valve 15 is opened and a constant flow rate of 11008 cc of gas flows into the pressure tank 2. At this time, the inflow amount is as shown in Fig. 2 (a
) is constant as shown in Figure 2. Pressure tank 2 and breath tank 1
The pressure difference increases smoothly, and as shown in FIG. 2(b), the pressing force on the pressing substrate 21 increases smoothly.
As shown in Figure (c), the machine advances smoothly without stopping or decelerating.a Brace finishing machine A woodcutter who hardens the smoothing resin 22 with the pressing substrate 21 and the smoothing resin 22 in close contact with each other The pressing substrate 21 By releasing the mold, a smooth layer can be formed on the color filter 30.

Effects of the Invention As described above, the present invention provides a mechanism for smoothly increasing the pressing force, so that the smoothing resin 2 is smoothed by the pressing substrate 2I.
By allowing the press in step 2 to proceed smoothly without stopping or slowing down, it is possible to form a smooth layer without surface irregularities that can be seen with visual inspection equipment that applies the magic mirror principle.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main parts of a liquid crystal substrate manufacturing apparatus in an embodiment of the present invention. FIGS. Fig. 3 shows a cross-section of a liquid crystal substrate manufactured by a conventional manufacturing method. Fig. 4 shows a cross-section of a main part of a conventional liquid crystal substrate manufacturing apparatus. Gas inflow amount in conventional example Characteristics of press advancement speed @
Figure 6 is a cross-sectional view of a conventional substrate showing the mechanism by which surface irregularities occur. Figure 7 is a front view of a conventional color filter substrate with irregularities on its surface.
... Pressure tank 3 ... Table 8 ... Rubber sheet 10 ... Claw 11 ... Vacuum layer 15 ... Flow rate control valve 20a, 20b, 20cm color filter 2
1...Press substrate 22...Smoothing resin 30...Color filter substrate 40...Surface unevenness Name of agent Patent attorney Shigetaka Awano and one other person Figure Figure Figure Figure (α) Figure 7 (Bn4θ surface unevenness

Claims (4)

[Claims] (1) After coating the liquid crystal substrate with an electron beam or ultraviolet curing resin that will serve as a smoothing resin, in a vacuum chamber separated into two tanks by a partition wall, between the two tanks that will act as a pressing force on the pressing substrate. While smoothly increasing the pressure difference, the pressing substrate is pressed from one end of the liquid crystal substrate to the opposite end or from the center to both ends, and the pressing substrate stops pressing the resin-coated surface. Alternatively, after allowing the smoothing to proceed smoothly without deceleration, the smoothing resin is cured by electron beam or ultraviolet irradiation, and the pressing substrate is released from the mold, thereby forming a smoothing layer made of the smoothing resin on the surface of the liquid crystal substrate. A method for manufacturing a liquid crystal substrate, the method comprising: forming a liquid crystal substrate; (2) The method for manufacturing a liquid crystal substrate according to claim (1), wherein the liquid crystal substrate is a color filter substrate. (3) A liquid crystal substrate manufacturing apparatus that forms a smooth surface made of the coating resin on the liquid crystal substrate by pressing the resin surface coated on the liquid crystal substrate with a pressing substrate,
A mechanism for holding the pressing substrate, a mechanism for pressing the pressing substrate from above, a mechanism for lowering the pressing substrate for pressing, and a mechanism for smoothly increasing the pressing force of the pressing substrate. A manufacturing device for liquid crystal substrates. (4) As a mechanism for smoothly increasing the pressing force of the pressing substrate, a chamber is provided in which the pressing surface to the pressing substrate is made of a rubber sheet, and a constant flow rate of gas is sent into the chamber. 4. The liquid crystal substrate manufacturing apparatus according to claim 3, further comprising a mechanism for smoothly increasing the pressure difference between the inside and outside of the chamber.