# US 7,609,358 B2 · Liquid crystal display device and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,358 B2 - Document ID: US7609358B2 - Status: Granted - Kind: B2 - Application number: 10/757,459 - Filed: 2004-01-15 - Published: 2004-07-29 - Granted: 2009-10-27 - Earliest claimed: 2003-01-16 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Shunpei Yamazaki; Hideaki Kuwabara - Web page: https://patentgrep.com/patent/US7609358B2 ## CPC - G02F 1/1341: Filling or closing of cells - G02F 1/133351: {Manufacturing of individual cells out of a plurality of cells, e.g. by dicing} - G02F 1/13415: {Drop filling process} - Y10T 156/10: Methods of surface bonding and/or assembly therefor - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract As the screen size becomes larger, it is required to make the device achieve higher definition, higher open area ratio, and higher reliability. Further, requirements for improvements in productivity and cost minimization are also increased. In the present invention, a substrate is pasted with a counter substrate after the liquid crystal material 114 is discharged (or dripped) only over a pixel area that is on a pixel electrode provided over a substrate with a large area by ink jet. Further, both of applying a seal material and dripping of a liquid crystal may be performed to the counter substrate. The total amount of liquid crystal use in a manufacturing process is reduced by forming a liquid crystal layer by ink jet. ## Claims ### Claim 1 A manufacturing method of a liquid crystal display device, comprising: forming an alignment layer over a first substrate; performing a rubbing on the alignment layer in a rubbing direction; forming a seal material layer that surrounds a pixel area provided on the first substrate by ink-jet; discharging a plurality of droplets containing a liquid crystal by ink-jet only on a region of the first substrate, the region being surrounded by the seal material layer; pasting the first substrate and a second substrate; and dividing the pasted first and second substrates, wherein the plurality of droplets containing the liquid crystal are discharged under reduced pressure by ink-jet from a plurality of nozzles which relatively move to the rubbing direction. ### Claim 2 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the plurality of droplets is discharged over a pixel electrode provided on the pixel area from a plurality of nozzles. ### Claim 3 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the step of discharging the plurality of droplets containing the liquid crystal is carried out while the first substrate is heated. ### Claim 4 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the steps of pasting the first and second the substrates is carried out in an inert atmosphere under an atmospheric pressure, or under reduced pressure. ### Claim 5 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the plurality of droplets containing the liquid crystal are discharged over a pixel electrode under reduced pressure. ### Claim 6 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the step of discharging the plurality of the droplets containing the liquid crystal is preformed in an inert atmosphere under 1×102 Pa to 2×104 Pa. ### Claim 7 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the step of discharging the plurality of the droplets containing the liquid crystal is preformed in a vacuum at 1 Pa to 5×104 Pa. ### Claim 8 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the liquid crystal is applied intermittently. ### Claim 9 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the liquid crystal is applied continuously. ### Claim 10 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the liquid crystal display device is an active matrix type. ### Claim 11 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the liquid crystal display device is a passive matrix type. ### Claim 12 (depends on 1) A method according to claim 1, wherein the liquid crystal display device is incorporated with an electronic device selected from the group consisting of a personal computer, a mobile computer, a CD player, a DVD player, a portable book and a display device. ### Claim 13 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein the first substrate is formed from a plastic substrate and the second substrate is formed from a plastic substrate. ### Claim 14 A manufacturing method of a liquid crystal display device, comprising: forming an alignment layer over a first substrate; performing a rubbing on the alignment layer in a rubbing direction; forming a first seal material layer that surrounds a pixel area provided on the first substrate by ink-jet; forming a second seal material layer on a second substrate by ink-jet; forming a liquid crystal layer by selectively discharging a plurality of droplets containing a liquid crystal by ink-jet only on a region of the first substrate, the region being surrounded by the first seal material layer; pasting the first substrate and the second substrate; and dividing the pasted first and second substrates, wherein the plurality of droplets containing the liquid crystal are discharged under reduced pressure by ink-jet from a plurality of nozzles which relatively move to the rubbing direction. ### Claim 15 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the plurality of droplets is discharged over a pixel electrode provided on the pixel area from a plurality of nozzles. ### Claim 16 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the step of discharging the plurality of droplets containing the liquid crystal is carried out while the first substrate is heated. ### Claim 17 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the steps of pasting the first and second the substrates is carried out in an inert atmosphere under an atmospheric pressure, or under reduced pressure. ### Claim 18 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the plurality of droplets containing the liquid crystal are discharged over a pixel electrode under reduced pressure. ### Claim 19 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the step of discharging the plurality of the droplets containing the liquid crystal is preformed in an inert atmosphere under 1×102 Pa to 2×104 Pa. ### Claim 20 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the step of discharging the plurality of the droplets containing the liquid crystal is preformed in a vacuum at 1 Pa to 5×104 Pa. ### Claim 21 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the liquid crystal is applied intermittently. ### Claim 22 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the liquid crystal is applied continuously. ### Claim 23 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the liquid crystal display device is an active matrix type. ### Claim 24 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the liquid crystal display device is a passive matrix type. ### Claim 25 (depends on 14) A method according to claim 14, wherein the liquid crystal display device is incorporated with an electronic device selected from the group consisting of a personal computer, a mobile computer, a CD player, a DVD player, a portable book and a display device. ### Claim 26 (depends on 1) A manufacturing method of a liquid crystal display device according to claim 1, wherein a column spacer formed of resin is formed between the first substrate and the second substrate. ### Claim 27 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein the first substrate is formed from a plastic substrate and the second substrate is formed from a plastic substrate. ### Claim 28 (depends on 14) A manufacturing method of a liquid crystal display device according to claim 14, wherein a column spacer formed of resin is formed between the first substrate and the second substrate. ### Claim 29 A manufacturing method of a liquid crystal display device, comprising: forming an alignment layer over a first substrate; performing a rubbing on the alignment layer in a rubbing direction; forming a seal material layer that surrounds a pixel area provided on the first substrate by ink-jet; discharging a plurality of droplets containing a liquid crystal by ink-jet only on a region of the first substrate, the region being surrounded by the seal material layer; pasting the first substrate and a second substrate under reduced pressure; and dividing the pasted first and second substrates, wherein the plurality of droplets containing the liquid crystal are discharged by ink-jet from a plurality of nozzles which relatively move to the rubbing direction. ### Claim 30 (depends on 29) A manufacturing method of a liquid crystal display device according to claim 29, wherein the step of discharging the plurality of droplets containing the liquid crystal is carried out while the first substrate is heated. ### Claim 31 (depends on 29) A manufacturing method of a liquid crystal display device according to claim 29, wherein the plurality of droplets containing the liquid crystal are discharged over a pixel electrode under reduced pressure. ### Claim 32 (depends on 29) A manufacturing method of a liquid crystal display device according to claim 29, wherein the liquid crystal is applied intermittently. ### Claim 33 (depends on 29) A manufacturing method of a liquid crystal display device according to claim 29, wherein the liquid crystal is applied continuously. ### Claim 34 (depends on 29) A manufacturing method of a liquid crystal display device according to claim 29, wherein the liquid crystal display device is an active matrix type. ### Claim 35 (depends on 29) A manufacturing method of a liquid crystal display device according to claim 29, wherein the liquid crystal display device is a passive matrix type. ### Claim 36 (depends on 29) A manufacturing method of a liquid crystal display device according to claim 29, wherein the plurality of droplets containing the liquid crystal are discharged on the region under reduced pressure. ### Claim 37 A manufacturing method of a liquid crystal display device, comprising: forming an alignment layer over a first substrate; performing a rubbing on the alignment layer in a rubbing direction; forming a first seal material layer that surrounds a pixel area provided on the first substrate by ink-jet; forming a second seal material layer on a second substrate by ink-jet; forming a liquid crystal layer by selectively discharging a plurality of droplets containing a liquid crystal by ink-jet only on a region of the first substrate, the region being surrounded by the first seal material layer; pasting the first substrate and the second substrate under reduced pressure; and dividing the pasted first and second substrates, wherein the plurality of droplets containing the liquid crystal are discharged by ink-jet from a plurality of nozzles which relatively move to the rubbing direction. ### Claim 38 (depends on 37) A manufacturing method of a liquid crystal display device according to claim 37, wherein the step of discharging the plurality of droplets containing the liquid crystal is carried out while the first substrate is heated. ### Claim 39 (depends on 37) A manufacturing method of a liquid crystal display device according to claim 37, wherein the plurality of droplets containing the liquid crystal are discharged over a pixel electrode under reduced pressure. ### Claim 40 (depends on 37) A manufacturing method of a liquid crystal display device according to claim 37, wherein the liquid crystal is applied intermittently. ### Claim 41 (depends on 37) A manufacturing method of a liquid crystal display device according to claim 37, wherein the liquid crystal is applied continuously. ### Claim 42 (depends on 37) A manufacturing method of a liquid crystal display device according to claim 37, wherein the liquid crystal display device is an active matrix type. ### Claim 43 (depends on 37) A manufacturing method of a liquid crystal display device according to claim 37, wherein the liquid crystal display device is a passive matrix type. ### Claim 44 (depends on 37) A manufacturing method of a liquid crystal display device according to claim 37, wherein the plurality of droplets containing the liquid crystal are discharged on the region under reduced pressure. ### Claim 45 A manufacturing method of a liquid crystal display device, comprising: forming a seal material layer that surrounds a pixel area provided on a first substrate by ink-jet; forming an alignment layer over the first substrate by ink-jet; performing a rubbing on the alignment layer in a rubbing direction; discharging a plurality of droplets containing a liquid crystal by ink-jet over a region of the first substrate, the region being surrounded by the seal material layer; pasting the first substrate and a second substrate under reduced pressure; and dividing the pasted first and second substrates, wherein the plurality of droplets containing the liquid crystal are discharged from a plurality of nozzles which relatively move to the rubbing direction. ### Claim 46 (depends on 45) A manufacturing method of a liquid crystal display device according to claim 45, wherein the step of discharging the plurality of droplets containing the liquid crystal is carried out while the first substrate is heated. ### Claim 47 (depends on 45) A manufacturing method of a liquid crystal display device according to claim 45, wherein the plurality of droplets containing the liquid crystal are discharged over a pixel electrode under reduced pressure. ### Claim 48 (depends on 45) A manufacturing method of a liquid crystal display device according to claim 45, wherein the liquid crystal display device is an active matrix type. ### Claim 49 (depends on 45) A manufacturing method of a liquid crystal display device according to claim 45, wherein the liquid crystal display device is a passive matrix type. ### Claim 50 (depends on 45) A manufacturing method of a liquid crystal display device according to claim 45, wherein the plurality of droplets containing the liquid crystal are discharged on the region under reduced pressure. ### Claim 51 (depends on 45) A manufacturing method of a liquid crystal display device according to claim 45, wherein the plurality of nozzles move to a direction of rubbing of the alignment layer.