TWI228181B - A method for reducing glass substrate stress of a liquid crystal cell - Google Patents

Abstract

A method for reducing glass substrate stress of a liquid crystal cell. A hot-press apparatus for pressing glass substrates of a LCD is provided. The hot-press apparatus comprises a top press plate and a bottom press plate adjacent to an upper glass substrate and a bottom substrate of the LCD respectively. The hot-press plates are formed of a composite material with similar expansion coefficient to the glass substrates. The composite material comprises an epoxy and at least two fibers. The expansion coefficient of the first fiber is larger than that of the glass substrates, and the expansion coefficient of the second fiber is less than that of the glass substrates.

Description

1228181

The present invention relates to a method for reducing stress, and more particularly to a method for stress. Slope substrates with few liquid crystal cells (cells) are planted in the hot pressing process to reduce slope soil substrates. The main components of a liquid crystal display include a liquid crystal cell, a plate, a light reflecting plate, and a diffusion plate. , Ϊ Ϊ plate, upper, transparent electrodes, liquid crystal materials, etc. The general way to make a liquid crystal cell is to first make a transparent conductive film, a pixel electrode, an alignment layer, a phase control structure, etc. on a glass substrate, and then coat the packaging material around the inside of the glass substrate. Then The spacers (SP a Cer) are scattered in the display area surrounded by the packaging material, and the two substrates are bonded to each other, which can be used to set the thickness of the liquid crystal layer. Then, enter the glass substrate bonding process. And using moderate heating and pressure, the sealing material can be hardened to form a liquid crystal tank. After the liquid crystal is injected into the liquid crystal tank, the liquid crystal injection port is closed, and then the subsequent step of attaching the polarizing plate = the reflecting plate is continued. The conventional hot pressing process is performed in a hot press machine. Please refer to Fig. 1 and Fig. 2. Fig. 1 shows a schematic diagram of the conventional hot press machine 10, and Fig. 2 It is a schematic cross-sectional view of the liquid crystal cell 20 shown in Fig. 1. The conventional hot press machine 10 includes an upper and a lower heating plate 12, 14 and an upper and a lower pressing plate 16, 18 are respectively arranged on the upper and lower sides. On the heating plates 12, 14 A liquid crystal cell 20 is placed between the upper and lower pressure plates 16 and 18 to perform a thermocompression process. The liquid crystal cell 20 includes an upper and a lower glass substrate 22 and 24, and a transparent electrode 26 is formed on On the glass substrates 22 and 24, an upper and lower matching film 28 is coated on the surface of the transparent electrode 26, and a plurality of granular spacers 30

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In the gap β between the glass substrates 22 and 24, the two glass substrates 2 and 24 can be attached to each other to set the thickness of the liquid crystal layer, and a packaging material 32 can be applied to the inner periphery of the glass substrates 22 and 24. When the cell 20 is subjected to the hot pressing process, the heating provided by the heating press table 1 () = the pressing condition. When the upper surface of the liquid crystal cell 20, the lower glass substrates 22 and 24 and the upper and lower pressing plates 16 and 18 are tightly connected. After you press, you can harden the packaging material 3.2, but 'the conventional technique uses metal materials to make the upper and lower pressure plates 丨 6, 18, ^ thermal expansion coefficient (coefflclent 〇f thermal expansi〇n, CTE y is greater than the glass substrate The coefficient of thermal expansion of 2 2, 2 4 so after the hot pressing a, the mismatch of the coefficients of thermal expansion will cause stress on the glass substrates u, 24, which will not only affect the strength of the glass substrates 22, 24 but also affect The quality of the liquid crystal cell 20. In view of this, at present, ceramic materials or polymers have been developed to make the upper and lower pressure plates 丨 6, 丨 8 to reduce the gap between the known thermal expansion coefficients, but the difference in the thermal expansion coefficient It is still too large and cannot effectively improve the problem of stress remaining on the glass substrates 22 and 24. The present invention proposes a method for reducing the stress of the glass substrate during the hot pressing process' is the use of different types of fiber materials with polymer trees The upper and lower pressure plates can be made of grease materials to 'make the thermal expansion coefficients of the upper and lower pressure plates close to those of ordinary glass substrates. The diagram is simply explained ▲ In order to make the above-mentioned objects, features, and advantages of the present invention more comprehensible' In the following, a preferred embodiment is given, and in conjunction with the accompanying drawings, the detailed description is as follows:

1228181 93 · 7 ·-7 Case No. 89123963_ 年月 日 __ V. Description of the Invention (3) Figure 1 shows a schematic diagram of a conventional hot press machine. Figure 2 shows the cross section of the liquid crystal cell not shown in Figure 1. Fig. 3 shows a schematic view of a hot press machine according to the present invention. Figure 4 shows the cross section of a structure of the composite material of the present invention is not intended. Figure 5 shows that the cross section of the two structures of the composite material of the present invention is not intended. Fig. 6 is a schematic sectional view showing a third structure of the composite material of the present invention. [Symbol description] 40 ~ hot press table; 42 ~ upper heating plate; 44 ~ lower heating plate; 46 ~ upper platen; 48 ~ lower platen; 50 ~ liquid crystal cell; 52 ~ polymer resin layer; 54 ~ first compound Layer; 5 6 ~ the second composite layer. Example Please refer to Fig. 3, which shows a schematic view of a heat press machine 40 of the present invention. The hot press table 40 of the present invention includes an upper and lower heating plate 42, 44 and an upper and lower pressing plate 46, 48 respectively disposed on the upper and lower heating plates 42, 44. A liquid crystal cell 50 is placed on The upper and lower pressing plates 4 6 and 4 8 are used for the hot pressing process. As mentioned above, the liquid crystal cell 50 includes an upper and a lower glass substrate, an upper and a lower transparent electrode are formed on the glass substrate, an upper and lower matching film are coated on the upper and lower transparent electrode surfaces, and a plurality of granular spacers Scattered in the gaps of the upper and lower glass substrates, and a packaging material is coated on

0611-5631TWFl.ptc Page 7 1228181 Correction θ ^ 1 ^ 89123963 V. Description of the invention (4) The inner periphery of the glass substrate. At the time, the heat-reduction process is performed on the surface of the liquid cell 50 by using a thermal machine on the surface of the liquid cell 50; breaking:; ::: heat and force; dust conditions, when the liquid crystal is crystallized, the sealing can be made: + = The board is closely combined with the upper and lower star boards 46 and 48 ^ q The clothing material is hardened to form a liquid crystal tank. It is mainly composed of poly-L lower plate 46, 48, which is a composite material, # M〇 桠 月 日, which is doped with multiple fiber materials, J: The expansion coefficient is larger than that of the glass substrate. Expansion system Expansion coefficient. The fiber material whose thermal expansion coefficient is less than the thermal expansion coefficient tX of the glass substrate, suitable weight and volume ratio is doped in the polymer tree. Yue: Γ makes the thermal expansion coefficient of this composite material approximate the process; The thermal expansion swells in order to solve the conventional stress remaining in the broken. _fi depends on the glass material, its thermal expansion coefficient range is 0.5 × U is 1:: C ', and the thermal expansion coefficient range of the commonly used glass substrate is 3xl0- / c ~ 5xl0_6 / t' The following special mention Structural glass material structure glass, referred to as s_gUss, its thermal expansion X material is glass clay. According to the present invention, the materials used by the upper and lower pressing plates 46 and 48 are: electronic glass (electronic "Ms") is used as the first fiber material, and graphite (Graphit fiber material is used). Table 1 shows the basic properties of glass and graphite. For isotropic materials, the thermal expansion coefficients are the same in all directions. However, for β-composites, their thermal expansion coefficients change with directionality. 8 pages〇611-5631TWFl.ptc

One is to dominate 1228181 ^ Β__89123961 V. Description of the invention (5) In terms of 'composite materials, there are two main types of thermal expansion, #, Noise I, thermal expansion coefficient & in the reinforcement fiber direction, and the other It is transverse (seven direchcnO coefficient of thermal expansion ατ, and due to the mechanical properties of the base material = =: bubi: small. The data listed in the table below is based on the aggregation tree: the typical properties of early fibers.

Fiber Type ~ Properties

. In order to make the thermal expansion coefficient of the upper and lower pressure plates close to 2. g χ 1〇 ~ 6 /

C 丄 can calculate the relationship between the volume ratio of polymer resin, E glass and graphite in the composite material, and the ratio by weight based on the above volume ratio, thermal expansion coefficient, and density values, and can produce a thermal expansion coefficient of about 歹 1 2 · \ χ l (H / t composite materials (tolerance error between thermal expansion coefficient and expansion coefficient of glass substrates is less than 丨 0%). As for the composite material's ^ = design, it can be made into a single-layer structure, double-layer Structure, multi-layer structure .... 冓 # μ Refer to Figures 4 to 6. Figure 4 shows a schematic cross-sectional view of the composite material of the present invention = the first structure, and Figure 5 shows the second structure of the composite material of the present invention. Sectional schematic diagram, FIG. 6 shows a schematic cross-sectional diagram of a third structure of the human material of the present invention.

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Modification ___-A kind of structure is a kind of single-layer junction. The addition of a specific ^ of E glass and graphite 'in a polymer resin layer 52 can make its coefficient of thermal expansion within the tolerance tolerance range. The second structure of the composite material of the present invention is a double-layer structure, which is composed of a first composite layer 54 and a second composite layer 56. A composite layer 54 includes a polymer resin and a specific proportion of Glass, the second composite layer 56 contains a polymer resin and a specific proportion of graphite, which can make its thermal expansion coefficient within a tolerance range. The second structure of the composite material of the present invention is a '^ multi-layered laminated structure', which is composed of the plurality of first composite layers 54 and the first composite layers 56 described above, as long as the whole The polymer resin, E glass and graphite have a proportional relationship, so that their thermal expansion coefficient can reach the tolerance range. It is worth noting that the stacking method of the first composite layer 54 and the second composite layer 56 must be symmetrically arranged up and down. Compared with the conventional technology using metal materials as the upper and lower pressure plates, 6, 18 'The present invention uses a composite material as the upper and lower pressure plates, 48, and the fibers with different thermal expansion coefficients that benefit the polymerization tree can make the composite material = The expansion coefficient is close to the thermal expansion of the glass substrate. Therefore, the thermal stress of the glass substrate will reduce the stress of the glass substrate, which can ensure the quality of the glass substrate and the quality of the substrate bonding process. Although the present invention has been disclosed in a preferred embodiment as above = Limit = Invention 'Anyone who is familiar with this skill, ... from the present invention: When a little change and embellishment can be made, so the present invention: The attached application patent shall prevail. ’,

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Claims (1)

1228181 93 · 7 ·-? -89123963_ 年月 日 __ ^-iL · ____ 6. Scope of patent application 1. A method for reducing the stress on the glass substrate of a liquid crystal cell 'is to provide a hot-press machine to a liquid crystal cell A hot pressing process is performed. The hot pressing machine includes an upper and a lower pressing plate which are respectively in contact with the upper and lower glass substrates of the liquid crystal cell. The pressing plate is composed of a composite material and its thermal expansion coefficient is similar to that of the glass substrate. The thermal expansion coefficient of the composite material includes: (a)-polymeric resin (e ρ ο X y); and (b) at least two fibers, wherein the thermal expansion coefficient of the first fiber is greater than that of the glass substrate Thermal expansion coefficient, the thermal expansion coefficient of the second fiber is smaller than the thermal expansion coefficient of the glass substrate, and the thermal expansion coefficient of the composite material is equal to that of the glass substrate. The tolerance range of the number is below 0%. 2. The method according to item 丨 of the patent application range, wherein the composite material is a single-layer structure. The method described in item 1 of the patent scope, wherein the composite material is a multilayer structure. The method described in item 1 of the fiber optic range, wherein the first-type fiber is composed of an E-glass fiber. path 5. The cubic fiber described in item 丨 of the scope of patent application is composed of graphite. Two of them are distant brothers 〇611-5631TWFl.ptc Page 11