TW552448B - A new manufacturing process of TFT LCD panel - Google Patents

Abstract

This is about an invention of a new manufacturing process of TFT LCD (thin film transistor liquid crystal display) panel, which starts by using a pair of thick glass substrate of thickness at 0.8 mm or above, compared to existing popular processes which use a pair of glass substrate of thickness at 0.7 mm or below; followed by sharpening the thickness of LCD panel to a combined thickness of 0.6 mm to 1.4 mm during the process of its fabrication, by utilizing a ""double-side lapping-polishing technology"". There are two trends which affect the development of manufacturing technology of TFT LCD the advance of manufacturing technology which enable the dimension of glass substrate to become bigger and bigger; and the market needs which require the glass substrate to be thinner and thinner. Yet the two trends are conflicting to each other. The bigger the dimension, the softer the glass substrate (which means easier to curve and bend), therefore more difficult to process. If and when the substrate glass is thinner, it will be even more difficult to process. Dimension of TFT substrates has been developing from 370 mm * 470 mm, 550 mm * 650 mm, 620 mm * 750 mm, 680 mm * 880 mm, 730 mm * 920 mm to over 1000 mm in both length and width. In the meantime market needs for glass substrate has been reducing from 0.7 mm, 0.63 mm to 0.55 mm or even 0.4 mm. Technically it will be extremely difficult to manufacture thin TFT LCD starting from very thin and big glass substrate. Even if it could be achieved, it will inevitably increase the cost of machines and equipments, increase the manufacturing cost, and the yield of good quality products could be low. This invention therefore provides a method to start the manufacturing process from using glass substrate of thickness at 0.8 mm or above, instead of using thinner and thinner substrate, and then to sharpen the panel thickness and polish it after the TFT panel is fabricated, by utilizing a ""double-side lapping-polishing technology"" which is now available in market. The final thickness of the two side substrates of TFT LCD panel could be between 0.6 mm to 1.4 mm. The benefits of this invention are to reduce the cost of manufacturing TFT-LCD panel, to increase yield of quality products and to give flexibility for making LCD panels of different thickness as required by market.

Description

552448 V. Description of the Invention (1) (Field of Invention) The present invention relates to a novel method for manufacturing a liquid crystal panel (LCD panel) of a thin film transistor liquid crystal display (Th in F i 1 m Transistor LCD, TFT-LCD). TFT liquid crystal panel (Thin Film Transistor LCD Panel) manufacturing method. In particular, it relates to a novel manufacturing method of "using a thicker glass substrate as a starting material in the manufacturing process of a TFT liquid crystal panel" to improve the glass substrate is too soft and difficult to handle due to the increase in the size of the glass substrate during the manufacturing process Difficulties. The present invention is to form a large-area TFT panel (TFT Panel, here and hereafter "panel" refers to those who have not yet injected liquid crystals) to form a plurality of liquid crystal sealing areas between a pair of large-area thick glass substrates. ;, "Liquid crystal panel" refers to those who have injected liquid crystals), then, (1) This large-area TF T panel containing a plurality of liquid crystal sealed areas is cut into a single small panel (including a single liquid crystal sealed area); "jtttk / double-side grinding" technology reduces the thickness of the upper and lower glass; moxibustion is then injected into the liquid crystal into the liquid crystal sealing area, and a method of manufacturing liquid crystal panels of various thicknesses with elasticity; or (2) this contains a plurality of The large-area TFT panel of the liquid crystal sealing area is cut into a single small panel (including a single liquid crystal sealing area);

552448 V. Description of the invention (2)-The liquid crystal is enclosed in the liquid crystal sealing area; virtue, the thickness of the upper and lower glass is reduced to double and polished. The manufacturing method of the liquid crystal panel with the same thickness is as follows: 3) Research and technology will change the thickness of the glass on the upper and lower sides of the large surface, and then 'cut into a single facet and then inject liquid crystal; or inject liquid crystal and then cut into a small LCD panel. It can be elastically made into a single large-area TFT panel with various thicknesses. It can also be cut into a medium-area tft panel (including several liquid crystal sealing areas); after that, the square liquid crystal according to (1), (2), (3) above In addition to this novel manufacturing method, in addition to making TFT liquid crystal panels of various thicknesses elastically, it can reduce costs and improve the yield of finished products. (Advanced technology) TFT LCD is one of flat panel displays (FPD). A glass substrate is arranged above and below, and the two are arranged in parallel at a certain distance. 'The substrate has transparent electrodes, color filters, circuit lines, thin film transistors (TFTs), alignment films, etc., and a liquid crystal sealing area is formed by a sealing material.' After the liquid crystal is injected into the liquid crystal sealing region, the injection port can be sealed.

Page 10 552448 V. Description of the invention (3) The conventional or currently known TFT liquid crystal panel manufacturing method is to form a plurality of liquid crystal sealing areas between a pair of parallel large glass substrates facing each other to form a large area TFT panel. 'Manufacturing method of dividing this large area panel and then making a plurality of liquid crystal panels. The size and thickness of the glass substrate used in the large-area TFT panel are fixed when the equipment is set. With the advancement of technology, its size has been increased from 370 mm 氺 470 mm, 550 mm 氺 650 mm, 620 mm 氺 750 mm to 680 mm * 88 0 mm, and 730,000 mm * 9200 mm. The fifth generation) has developed to a length and width of more than 1000 mm; the purpose is to increase production capacity and reduce unit manufacturing costs. As for the thickness, a glass substrate is usually 0.7 mm ’, but it is gradually becoming thinner to 0.63 mm in ^ 〇 5 5 mm, or even 0.4 mm. However, the two development directions of glass substrates are becoming larger and thinner. From a technical point of view, there are contradictions. This is mainly because the thinner the glass substrate, the easier it is to bend and difficult to handle, and the thinner and the larger the size, the softer and more difficult to handle. Therefore, those who manufacture large-area TFT liquid crystal panels, if they want to use large-sized glass substrates and thinner glasses, the machine 5 | the design and manufacturing difficulty of the equipment will be greatly increased, and even if it can be completed, The cost of machinery and equipment is bound to be south. For those who use this equipment to manufacture T ρ τ liquid crystal panels, the manufacturing cost will also be relatively greatly increased, and the manufacturing yield will also be reduced because large and thin glass substrates are not easy to operate.

Page 11 552448 -------- V. Description of the invention (4) (Detailed description of the invention) The present invention is an improvement made in consideration of the problems described in the (prior art), and then after deep research and development. The purpose is to provide a method to increase the thickness of the glass substrate in the reverse direction during the manufacturing process of the TFT liquid crystal panel, so that the manufacturing process can easily increase the size of the glass substrate to reduce the cost and increase the yield. In the manufacturing method of the TFT liquid crystal panel of the present invention, in the manufacturing process, a glass thicker than a glass substrate used in the past or the current practice is used as a starting material (the current conventional size is 0.7 mm or 0.63 mm or 0 mm). 55 mm, the present invention uses a glass substrate with a thickness of 0.8 mm or more). In this way, the size of a large area TFT liquid crystal panel can be easily developed toward large size, and its length and width can be easily operated even if it exceeds 1 m. In the present invention, after a TFT panel with a large area and a thick glass substrate including a plurality of liquid crystal sealing areas is manufactured, (1) the large area panel is first cut into a single small panel (including a single liquid crystal sealing area), and then the "double "Surface grinding" technology reduces the thickness of the upper T = 3 of a single small panel, so that the upper and lower glass of the panel are exposed to the external liquid crystal injection port. "Work = time", then pass through the inside, and then seal the LCD. 0 Will = say W in the liquid crystal sealing area (2) first cut a large area panel into a liquid crystal panel, or paper as a small panel (including a single liquid crystal seal)

After 552448, the liquid crystal injection port exposed to the outside V. Description of the invention (5) Entry area] It is injected into the enclosed area of the liquid crystal, then the liquid crystal and the main liquid are sealed, and then it is lifted up and down by the "double-side grinding" technology. Two = glass = D; reduce the thickness to reduce the total thickness of the upper and lower glass pieces to a thickness of 0 (3) _ to make a liquid crystal panel; or '· mm to 1 · 4 to "double-sided grinding" The technology cuts the upper and lower thicknesses of the large-area panel, so that the total thickness of the glass on both sides of the LCD panel and the surface of the house are broken between 0 mm and 1.4 mm. After that, it may be cut into panels and then injected with liquid crystal. ; Or inject liquid crystal first, and then cut into two small faceted LCD panels. 『Zhanweizao—Small square TFT panel made of small and large-facet crystal sealing method can also be cut into a medium-area TFT panel (entering area); after that, it can be made according to (1), (2) or ^ 3) above A single small LCD panel with a thickness of 0 · 6 mm to 1 · 4 mm. The characteristics of this manufacturing method are: (1) At the beginning of the manufacture of the TFT liquid crystal panel, a pair of glass having a thickness of more than 0 · 8 mm is used as the substrate material (compared with the current glass substrate under Xi + Knowledge). Thickening); (2) Because the glass substrate is thickened, it is less prone to bending and deformation and easy to operate, so it is easy to develop to a large size during the manufacturing process of a large area TFT panel. Not only 680 mm * 880 mm, and 730 mm * 920 mm

Page 13 552448 V. Description of the invention (6) The board is easy to make, even if it is too large in length and width, it is still 7 + Gan, and it is well made, and it will not be easy to make because the glass is too thin and easy to deform. It will also be greatly improved; (3) There are multiple liquid crystal sealing areas between the glass substrates of large-area TFT panels, and the manufacturer can cut them into a single small panel (including the input area), and then cut into a single Facet J panel "Several liquid crystal seals (4) Apply" double-sided grinding "technology to thin the upper TFT panel or a single small tft and thin the TFT panel or middle surface, so that the upper and lower sides are broken glass = the thickness of the glass is cut mm; the thinned TFf becomes 0.6 panel to 1.4 panel (including a single liquid crystal sealing area), and the blade is cut into a single small plate (including several liquid crystal sealing areas) and then 3 T becomes medium Area surface; Ran is cut into a single small panel; (5) After thinning, the liquid crystal is exposed to the outside through the liquid crystal enclosed area, and the liquid crystal is injected into the panel through the opening; The receiver seals the liquid crystal injection opening to make the liquid crystal (6 ) Can also be flexible after the above-mentioned middle-area TFT panel into the liquid crystal, Using "do while m Note the small plate to the TFT panel; double-side polishing" technology thinning, made of liquid crystal

Page 14 S ---__ 552448 5. Description of the invention (7) (7) The total thickness can be controlled between 0 · 6 mm and 1 · 4 mm. It can be widely used in mobile phones and PDAs (Personal Digital Assistant). ), Laptops, or desktop monitors or TVs are equivalent to mobile phones, PDAs (personai Digital Assistant), laptops, or desktop monitors or TVs, to meet the needs of the market. elasticity. The method of double-side grinding is to use a double-side grinding machine in combination with jigs, abrasive materials and abrasives to grind both sides of the panel or liquid crystal panel at the same time; first rough cut (1 a PP ing) both sides of the panel or liquid crystal panel. After thin, a fine polishing (P ο 1 ishing) is performed to make the surface flatness of the panel or the liquid crystal panel reach the required specification. Generally used abrasive liquids, such as osmium oxide. Generally used abrasive materials are diamond materials containing diamond fine particles or diamond powder, but they are not particularly limited. The time required for "double-side grinding" is determined by the double-side grinding machine used, the base material, the rotation speed, the platen pressure, and the polishing liquid composition. (Example) Example 1 The starting material uses a pair of large-area glass substrates (680 mm * 880 mm) with a single sheet thickness of 1.1 mm, one of which is made of color filter after chromium plating, and the other is made of array The process is made into a TFT board. Both are in the process

Page 15 552448 5. Description of the invention (8) Divided into liquid can be cut into nine 1 4 · 1 inch panels. After that, the liquid crystal is sealed into the area in the shape of a sealing material, and then the two are opposed to each other, and then the sealing material is hardened and sealed. The enclosed area of the liquid crystal is divided into nine 14.1-inch TFT panels. ^, 'The liquid crystal is injected into the sealed region of the liquid crystal through the liquid crystal injection port exposed to the outside, and then the liquid crystal injection port is sealed. After that, the technique of “r double-sided grinding” is used to rough throw each crystal plate with a diamond material containing diamond fine particles to a total thickness of 0.8 mm; then, use a finer diamond ^ Powder paper is finely thrown to a predetermined flatness. The ultra-thin TFT LCD manufactured in this way can be used for notebook computers. Example starting material board (550 mm * light sheet, the other sheet can be cut into a printed sealing material and then hardened sealing material mm panel, such as the implementation degree of 0.8 mm and the liquid crystal sealing area of each small panel exposed area Inside, the connection system uses a pair of large-area glass substrates with a thickness of 1.1 mm (650 mm), one of which is made of color filters after being made of chrome, and then made of TFT plates by array process. Both have four 15 · 0 忖 panels in the manufacturing process. After that, the two are printed into a liquid crystal sealed area by a printing method, and then the two are bonded to each other to complete the packaging. The whole packaged 5500 mm * 650 example 1 is ground by the technique of "double-side grinding" to a total thickness to a predetermined flatness. The thinned panel is then divided into four small panels at 15 · 0 according to the original specifications. After that, liquid crystal is injected into the liquid crystal through an external liquid crystal injection port to seal the liquid crystal injection port. Ultra-thin TFT liquid made in this way

552448 5. Description of the invention (9) The crystal board can be used for assembling a notebook computer or a desktop computer monitor. After the implementation of the example area, the two will be combined, and the sheet contains exposed liquid crystals. The total area of the crystal plate starting material is a single sheet thickness. .1 mm is a pair of large glass substrates (73 0 mm * 92 0mm), one of which is coated with a resin to form a color filter 'and the other is manufactured into an TFT panel by an array process. In the manufacturing process, it is planned to be cut into nine 15 · 0 inch panels. After that, a sealing material is used to form the liquid crystal sealing area, and then the two are opposed to each other and the sealing material is hardened to complete the packaging. This large TFT panel is then divided into ^ 3 15.0-inch liquid crystals sealed in F # and connected together; a 48-inch (he-area medium-area panel. Then, the liquid crystal is injected into the LCD through an external liquid crystal injection port. The liquid crystal injection port is then sealed in each sealed area of the middle-area panel. After that, the technology of Example I double-sided grinding is used to thin and grind each liquid crystal panel to a thickness of 1.0 / mm and to a predetermined flatness. After the ultra-thin medium TFT liquid crystal panel thus produced, it was cut into three 15-inch tft liquids for assembly as a notebook computer. Example 4 One of a pair of large-area glass-based starting materials Use monolithic thickness 1

Page 17 552448 V. Description of the invention (ίο) plate (620 mm * color filter, another plan can be cut into a slab material to form a liquid crystal sealing material to complete the sealing as in Example 1 from the plate to the total thickness of the panel according to the original After the specification, the basic elements of the ultra-thin and small liquid crystal panel sealing machine (750 mm) were respectively inserted into the liquid crystal, and one of them was coated with a resin to form a colored sheet and then the array was made into a TFT panel. Both are 7 in the manufacturing process. 1 6 * 1 6 = 2 5 6 2-leaf panels. After that, the two are enclosed in the area by ^, and then the two are opposed to each other and then hardened. The technology of "double-side grinding" of the entire packaged 620 mm * 750 mm panel is thinned and ground to a surface of 0 · 8 mm and a predetermined flatness. The thinned and enclosed LCD area was divided into 2 5 6 small panels. A small panel is exposed to the outside of the liquid crystal injection port, and then the liquid crystal injection port is sealed. This completes the production. The fabricated 2-inch ultra-thin TFT liquid crystal panel is an assembly hand. Example 5 Plate 2 m: ϊ sheet / moderate h 1 mm-for large-area glass-based color filter, the other sheet: 2: sheet is coated with tree vinegar After the cloth is made into color, it can be cut into TFT panels. In both processes, a sealing material is printed to form a 2J panel of liquid crystal seal. After that, the two are printed by a method of re-hardening and sealing #complete sealing f ^ ′ and then the two are opposed to each other and bonded to each other. ”Divide them into 25 pieces each? Then this 730 mm wood 920 mm panel is double-sided with…, 2 middle panels, as in the embodiment

Page 18 552448 V. Description of the invention (π) Grinding "The technology of thinning and grinding each middle panel to a total thickness of 1.0 mm and a predetermined flatness. Thereafter, the liquid crystal is injected into the sealed region of the liquid crystal through each of the liquid crystal injection ports exposed to the outside, and then the liquid crystal injection port is sealed to produce a middle liquid crystal panel. Finally, it was divided into four 4-inch small LCD panels. This completes the production of ultra-thin LCD panels. The manufactured 4-inch ultra-thin TFT LCD panel can be used as a basic component for assembling pDA (PersOnal Assistant). The starting material of Example 6 is a pair of large-area glass substrates (1000 mm * 12,000 mm) with a single sheet thickness of 1.1 mm, which is transparent, one of which is color-filtered through a chrome-plated shirt. Chip, and the other is made into a TFT board through an array process. The two f are planned to be cut into nine 17-inch panels during the manufacturing process. After that, the second material is used to form a liquid crystal sealing area, and then the two are adhered to each other, and the material is packaged. This large TFT panel is then divided into three TFT panels with a medium-sized LCD enclosure area. After that, the liquid crystal is injected into the middle-area panel by exposing the "ϊ =; sealing the liquid crystal injection port. After that, the technique of the embodiment-^ ^ i;" thins and grinds each liquid crystal panel to its total board / supply. "Yue Lei Meng Lei was" cut into three 17.0-inch tft LCD panels, which were assembled for computer monitors or televisions.

Page 19 552448 Illustration Simple

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Claims (1)

552448_ I ------ Ί i ^: L · Shi i_ i rr ΚΚΠ! Application for patent application 1 · A method for manufacturing a thin film transistor liquid crystal panel (hereinafter referred to as a TFT liquid crystal panel), the method includes the following steps or Features: (1) At the beginning of the manufacture of TFT liquid crystal panels, a pair of glass with a thickness of 0.8 mm or more is used as a substrate material, (2) a large-area TF T panel is produced with the pair of glass substrates, and a large area There are a plurality of liquid crystal sealing areas between the glass substrates of the TFT panel. (3) The large area TFT panel is cut into a single small TFT panel (including a single liquid crystal sealing area). (4) The liquid crystal is injected into the liquid crystal injection port exposed to the outside. Each small liquid crystal of a single TFT panel is sealed in the area, and then the liquid crystal injection port is sealed to make a small-area TFT liquid crystal panel. (5) The thickness of the upper and lower glass of the small-area liquid crystal panel is reduced by "double-side grinding" technology. Reduce the total thickness of the glass on both sides of the LCD panel to between 0.6 mm and 1.4 mm. 2. A method of manufacturing a TFT liquid crystal panel, which includes the following steps or features: (1) At the beginning of the manufacture of a TFT liquid crystal panel, a pair of glass having a thickness of more than 0.8 mm is used as a substrate material, (2) A large-area TFT panel is produced from the pair of glass substrates, and there are a plurality of liquid crystal sealing areas between the glass substrates of the large-area TFT panel. '(3) The thickness of the upper and lower glass of the large-area panel by "double-side grinding" technology Thinned to reduce the total thickness of the glass on both sides of the LCD panel to Page 21 552448 VI. The scope of patent application is between 0.6 mm and 1.4 mm, and then (4) the thinned large area panel is cut into a liquid crystal sealing area), and it becomes an early small panel (including Single (5) Inject liquid crystal into a small entrance early through each liquid crystal seal of the liquid crystal injection port TFT panel exposed to the outside to make a small area TFT liquid crystal panel. Then seal the liquid crystal The method includes the following steps or single sheet thickness in (1) At the beginning of the manufacture of TFT liquid crystal panels, a glass of more than 0.8 mm is used as the substrate material. (2) A large-area TFT panel is manufactured from the pair of glass substrates, and there are a plurality of glass substrates between the large-area TFT panel. (3) cutting a large-area TFT panel into a medium-area TFT panel (including a plurality of liquid-crystal-encapsulating regions), and (4) (a) First inject liquid crystal into each liquid crystal sealing area of the medium area TFT panel. 'Seal the liquid crystal injection port to make a medium area TFT liquid crystal panel.' The thickness of the two-sided glass is reduced, so that the total thickness of the two-sided glass of the liquid crystal panel is reduced to between 0.6 mm and 1.4 mm. Finally, the cut / specialized medium-area liquid crystal panel is divided into a single small TFT liquid crystal. Plate, or (b) the "double-sided grinding" technology Page 22 552448 6. The thickness of the patent application glass is reduced to reduce the total thickness of the glass on both sides of the liquid crystal panel to between 0.6 mm and 1.4 mm, and then liquid crystal is injected to make a medium-area TFT liquid crystal panel. Finally, The thinned middle-area liquid crystal panel is divided into a single small TFT liquid crystal panel. 4. For the manufacturing method of the liquid crystal panel with the scope of patent application No. 1, 2 or 3, the thickness of the starting glass substrate is 0.8 mm -2.0 mm, and the total thickness of the upper and lower glass of the liquid crystal panel is from 1.6 mm- 4.0 mm ground to 1.4 mm or less, thickness of 0 · 6 mm or more. 5. According to the method for manufacturing a liquid crystal panel in item 4 of the scope of patent application, the thickness of the starting glass substrate is 0.9 mm-1.5 mm. 6. According to the method for manufacturing a liquid crystal panel in item 5 of the patent application, the thickness of the starting glass substrate is 1.0 mm-1.3 mm. 7. According to the method for manufacturing a liquid crystal panel under the scope of the patent application, the thickness of the starting glass substrate is 1.1 mm. 8. For the manufacturing method of the liquid crystal panel with the scope of patent application No. 5, 6 or 7, the total thickness of the glass on the upper and lower sides of the liquid crystal panel is ground to "1.4 double bands" by using the "double-side grinding" technology, and 0 · Over 6 bandits. 9. If the manufacturing method of the liquid crystal panel in item 8 of the patent application is based on Page 23 552448 Page 24