Display device having a curved surface

• US 7,446,339 B2
• Filed: 06/08/2006
• Issued: 11/04/2008
• Est. Priority Date: 12/28/2001
• Status: Expired due to Term

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Takayama, Toru, Maruyama, Junya, Yamazaki, Shunpei, Murakami, Masakazu
• Primary Examiner(s): Smoot; Stephen W
• Application Number:
  US11/422,980
• Publication Number:
  US 20060216909A1
• Time in Patent Office: 880 Days
• Field of Search: 438/458, 257/E33.006
• US Class Current: 257/72
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/1341 Filling or closing of cells
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: H01L 21/2007 Bonding of semiconductor wafers to insulating substrates or to semiconducting substrates using an intermediate insulating layer H01L21/2011 takes precedence; bonding of semiconductor wafers to semiconductor wafers for junction formation H01L21/187
• CPC Class Codes: H01L 21/67092 Apparatus for mechanical treatment or grinding or cutting, see the relevant groups in subclasses B24B or B28D
• CPC Class Codes: H01L 21/6835 using temporarily an auxiliary support
• CPC Class Codes: H01L 21/76251 using bonding techniques
• CPC Class Codes: H01L 2221/6835 used as a support during build up manufacturing of active devices
• CPC Class Codes: H01L 2221/68363 used in a transfer process involving transfer directly from an origin substrate to a target substrate without use of an intermediate handle substrate
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/1218 with a particular composition or structure of the substrate
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1259 Multistep manufacturing methods
• CPC Class Codes: H01L 27/1262 with a particular formation, treatment or coating of the substrate
• CPC Class Codes: H01L 27/1266 the substrate on which the devices are formed not being the final device substrate, e.g. using a temporary substrate
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01L 29/66757 Lateral single gate single channel transistors with non-inverted structure, i.e. the channel layer is formed before the gate
• CPC Class Codes: H01L 29/78603 characterised by the insulating substrate or support H01L29/78657 takes precedence
• CPC Class Codes: H01L 2924/30105 : Capacitance
• CPC Class Codes: H01L 2924/3025 : Electromagnetic shielding
• CPC Class Codes: H10K 2102/311 : Flexible OLED
• CPC Class Codes: H10K 59/12 : Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/1201 : Manufacture or treatment
• CPC Class Codes: H10K 59/1213 : the pixel elements being TFTs
• CPC Class Codes: H10K 59/123 : Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/131 : Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 71/00 : Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/50 : Forming devices by joining two substrates together, e.g. lamination techniques
• CPC Class Codes: H10K 71/80 : using temporary substrates
• CPC Class Codes: H10K 77/111 : Flexible substrates
• CPC Class Codes: Y02E 10/549 : Organic PV cells

Abstract

The object of the invention is to provide a method for fabricating a semiconductor device having a peeled layer bonded to a base material with curvature. Particularly, the object is to provide a method for fabricating a display with curvature, more specifically, a light emitting device having an OLED bonded to a base material with curvature. An external force is applied to a support originally having curvature and elasticity, and the support is bonded to a peeled layer formed over a substrate. Then, when the substrate is peeled, the support returns into the original shape by the restoring force, and the peeled layer as well is curved along the shape of the support. Finally, a transfer object original having curvature is bonded to the peeled layer, and then a device with a desired curvature is completed.

Claims

1. A flexible device, comprising:

an adhesive on a transfer object,

an oxide layer on the adhesive,

a layer comprising wiring lines and pixel electrodes on the oxide layer, and

a support opposed to the transfer object and located over the layer;

wherein a curvature radius of a curved surface of the flexible device is 50 cm to 200 cm.

2. A flexible device according to claim 1, wherein the layer further comprises TFTs and retention capacitances.

3. A display device, comprising:

an adhesive on a transfer object,

an oxide layer on the adhesive,

a peeled layer on the oxide layer, and

a support opposed to the transfer object and located over the peeled layer;

wherein liquid crystals interposed between the transfer object and the support, and

wherein a radius of curvature of a curved surface of the display device is 50 cm to 200 cm.

4. A display device according to claim 3, wherein the support is transparent.

5. A display device according to claim 3, wherein the display device is a reflective liquid crystal display device.

6. A vehicle comprising a display, comprising:

an adhesive on a transfer object,

an oxide layer on the adhesive,

a layer comprising wiring lines on the oxide layer, and

a support opposed to the transfer object and located over the layer;

wherein a curvature radius of a curved surface of the display is 50 cm to 200 cm.

7. A vehicle according to claim 6, wherein the vehicle is selected from the group consisting of an automobile, an aircraft, a train, and an electric railcar.

8. A vehicle comprising a display, comprising:

an adhesive on a transfer object,

an oxide layer on the adhesive,

a first peeled layer on the oxide layer,

a second peeled layer on the first peeled layer, and

a support opposed to the transfer object and located over the second peeled layer;

wherein a curvature radius of a curved surface of the display is 50 cm to 200 cm.

9. A vehicle according to claim 8, wherein the vehicle is selected from the group consisting of an automobile, an aircraft, a train, and an electric railcar.

10. A vehicle comprising a display, comprising:

an adhesive on a transfer object,

an oxide layer on the adhesive,

a first layer comprising TFTs on the oxide layer,

a second layer comprising an organic light emitting diode on the first peeled layer, and

a support opposed to the transfer object and located over the second peeled layer;

wherein a curvature radius of a curved surface of the display is 50 cm to 200 cm.

11. A vehicle according to claim 10, wherein the vehicle is selected from the group consisting of an automobile, an aircraft, a train, and an electric railcar.