DISPLAY DEVICE

• US 20140043546A1
• Filed: 08/02/2013
• Published: 02/13/2014
• Est. Priority Date: 08/10/2012
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Hirakata, Yoshiharu
• Granted Patent: US 9,316,857 B2
• Time in Patent Office: Days
• US Class Current: 349/12
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 2201/07 buffer layer
• CPC Class Codes: G06F 1/1637 Details related to the display arrangement, including those related to the mounting of the display in the housing
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display

Abstract

A reduction in the weight of a display device with a touch sensor is achieved while a decrease in the sensitivity thereof is suppressed. The display device includes, between a pair of substrates, a touch sensor, a color filter, and a display portion provided with a display element. A stress relief layer whose product of the dielectric constant and specific gravity is smaller than that of the substrate provided with the touch sensor is provided, whereby parasitic capacitance between an electrode and a wiring included in the touch sensor and an electrode and a wiring included in the display portion can be reduced.

Claims

1. A display device comprising:

a first substrate;

a display element over the first substrate;

a color filter layer over the display element;

a stress relief layer over the color filter layer;

a sensor layer including a first electrode, a second electrode, a third electrode, an insulating layer, and a wiring over the stress relief layer; and

a second substrate over the sensor layer,

wherein a product of a specific gravity and a dielectric constant of the stress relief layer is smaller than that of the second substrate.

2. The display device according to claim 1, wherein the first electrode, the second electrode, and the third electrode are in contact with a same surface.

3. The display device according to claim 1, wherein each of the first electrode, the second electrode, and the third electrode has a light-transmitting property.

4. The display device according to claim 1, wherein the wiring is electrically connected to the first electrode and the third electrode through an opening in the insulating layer.

5. The display device according to claim 1, wherein the wiring overlaps with the second electrode with the insulating layer interposed therebetween.

6. The display device according to claim 1, wherein a product of a specific gravity and a dielectric constant of the insulating layer is smaller than that of the second substrate.

7. The display device according to claim 1, further comprising:

a bonding layer between the stress relief layer and the sensor layer,

wherein a thickness of the bonding layer is thinner than that of the stress relief layer.

8. The display device according to claim 1, wherein the stress relief layer includes a polarizer.

9. The display device according to claim 1, wherein the display element includes a liquid crystal or a light-emitting organic compound.

10. A display device comprising:

a first substrate;

a display element over the first substrate;

a color filter layer over the display element;

a planarization layer over the color filter layer

a stress relief layer over the planarization layer;

a sensor layer including a first electrode, a second electrode, a third electrode, an insulating layer, and a wiring over the stress relief layer; and

a second substrate over the sensor layer,

wherein a product of a specific gravity and a dielectric constant of the stress relief layer is smaller than that of the second substrate.

11. The display device according to claim 10, wherein the first electrode, the second electrode, and the third electrode are in contact with a same surface.

12. The display device according to claim 10, wherein each of the first electrode, the second electrode, and the third electrode has a light-transmitting property.

13. The display device according to claim 10, wherein the wiring is electrically connected to the first electrode and the third electrode through an opening in the insulating layer.

14. The display device according to claim 10, wherein the wiring overlaps with the second electrode with the insulating layer interposed therebetween.

15. The display device according to claim 10, wherein a product of a specific gravity and a dielectric constant of the insulating layer is smaller than that of the second substrate.

16. The display device according to claim 10, wherein the planarization layer comprises a same material of the insulating layer.

17. The display device according to claim 10, further comprising:

a bonding layer between the stress relief layer and the sensor layer,

wherein a thickness of the bonding layer is thinner than that of the stress relief layer.

18. The display device according to claim 10, wherein the stress relief layer includes a polarizer.

19. The display device according to claim 10, wherein the display element includes a liquid crystal or a light-emitting organic compound.