DISPLAY PANEL WITH MINIMUM BORDERS

• US 20170168463A1
• Filed: 05/13/2016
• Published: 06/15/2017
• Est. Priority Date: 12/15/2015
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Kim, Cheonhong, Hong, John, Bos, Jan, Chu, Yi-Nan
• Granted Patent: US 10,162,311 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 2201/56 Substrates having a particular shape, e.g. non-rectangular
• CPC Class Codes: G04G 17/045 Mounting of the display
• CPC Class Codes: G04G 17/06 Electric connectors, e.g. conductive elastomers
• CPC Class Codes: G04G 9/0064 in which functions not related to time can be displayed digital output to display devices of digital computers G06F3/14
• CPC Class Codes: G04G 9/10 by controlling light sources, e.g. electroluminescent diodes G04G9/0058 takes precedence
• CPC Class Codes: G04G 9/12 using light valves, e.g. liquid crystals
• CPC Class Codes: H05K 1/148 Arrangements of two or more hingeably connected rigid printed circuit boards, i.e. connected by flexible means
• CPC Class Codes: H05K 2201/052 Branched
• CPC Class Codes: H05K 2201/053 Tails
• CPC Class Codes: H05K 2201/056 Folded around rigid support or component
• CPC Class Codes: H05K 2201/10128 Display

Abstract

A device includes a substrate with a curvilinear perimeter segment adjoined to a plurality of facets, a display area, a border area surrounding the display area, and connection pads, divided into groups corresponding to the facets, in the border area. A flexible circuit board with arms coupled to the groups of connection pads is included. Another device includes a substrate having a display area, first connection pads within a border area peripheral to the display area, and a flexible circuit board having a first portion including second connection pads configured to be coupled to the first connection pads, and a second portion configured to accommodate a plurality of transmission lines extending from the second connection pads. An arc length of the first portion can be greater than that of the second portion and a center-to-center pitch of the second connection pads can be greater than that of the transmission lines.

Claims

1. A device, comprising:

a substrate, including;

a perimeter including a curvilinear segment adjoined to a plurality of facets, each adjacent pair of the plurality of facets adjoined at an obtuse angle,

a display area, including pixels on a surface of the substrate,

a border area surrounding the display area, and

a plurality of first connection pads, in the border area, coupled to the pixels, and divided into groups of first connection pads, each of the groups of first connection pads adjacent to a corresponding one of the plurality of facets; and

a flexible circuit board having a plurality of arms corresponding to the plurality of facets, each of the plurality of arms coupled to a corresponding one of the groups of first connection pads.

2. The device of claim 1, wherein the curvilinear segment is semicircular.

3. The device of claim 1, wherein the display area is round.

4. The device of claim 1, wherein the border area is annular.

5. The device of claim 1, wherein the border area has a width and, for a given diameter substrate and a given quantity of first connection pads, the width of the border area is reduced by adding facets to the plurality of facets to reduce a number of first connection pads in each of the groups of first connection pads.

6. The device of claim 1, further comprising a display driver operationally coupled to the flexible circuit board, wherein the groups of first connection pads adjacent to the plurality of facets are coupled to the display driver via the plurality of arms of the flexible circuit board.

7. The device of claim 6, wherein the flexible circuit board includes only one display driver.

9. The device of claim 1, wherein an arm of the plurality of arms includes one fold that is parallel to an edge of a corresponding facet and a plurality of non-parallel folds, to facilitate wrapping the arm around the perimeter of the substrate and positioning the flexible circuit board adjacent to a backside of the substrate after a plurality of second connection pads of each arm of the plurality of arms are coupled to corresponding first connection pads on the substrate.

10. The device of claim 1, wherein the device is incorporated into an electronic device selected from a group including at least one of a wearable device and a wristwatch-like wearable device.

11. A device, comprising:

a substrate, including;

a perimeter including a curvilinear segment adjoined to a plurality of facets, each adjacent pair of the plurality of facets adjoined at an obtuse angle,

a display area, including pixels on a surface of the substrate,

a border area surrounding the display area, and

a plurality of first connection pads, in the border area, coupled to the pixels, and divided into groups of first connection pads, each of the groups of first connection pads adjacent to a corresponding one of the plurality of facets; and

means for coupling to the plurality of first connection pads.

8. The device of claim 11, wherein each arm of the plurality of arms includes only one fold that is parallel to an edge of a corresponding facet, to facilitate wrapping each arm around the perimeter of the substrate and positioning the flexible circuit board adjacent to a backside of the substrate before a plurality of second connection pads of each arm are coupled to corresponding first connection pads of the substrate.

12. The device of claim 11, wherein the display area is round.

13. The device of claim 11, wherein the border area is annular.

14. The device of claim 11, wherein the means for coupling to the plurality of first connection pads comprise a flexible circuit board having a plurality of arms corresponding to the plurality of facets, each of the plurality of arms coupled to a corresponding one of the groups of first connection pads.

15. The device of claim 14, wherein each arm of the plurality of arms includes only one fold that is parallel to an edge of a corresponding facet, to facilitate wrapping each arm around the perimeter of the substrate and positioning the flexible circuit board adjacent to a backside of the substrate before a plurality of second connection pads of each arm are coupled to corresponding first connection pads of the substrate.

16. The device of claim 14, wherein an arm of the plurality of arms includes one fold that is parallel to an edge of a corresponding facet and a plurality of non-parallel folds, to facilitate wrapping the arm around the perimeter of the substrate and positioning the flexible circuit board adjacent to a backside of the substrate after a plurality of second connection pads of each arm of the plurality of arms are coupled to corresponding first connection pads on the substrate.

17. A device, comprising:

a substrate, including;

a first surface, an opposite second surface, and an edge at a perimeter of the substrate, wherein the edge includes a curvilinear segment adjoined to N facets, adjacent pairs of the N facets adjoined at an obtuse angle, wherein N is greater than or equal to two,

a plurality of pixels within a display area of the substrate,

N groups of connection pads, coupled to the plurality of pixels, within a border area peripheral to the display area, each of the N groups of connection pads adjacent to a corresponding one of the N facets; and

a flexible circuit board configured with N arms, wherein each of the N arms is coupled to a corresponding one of the N groups of connection pads.

18. The device of claim 17, wherein the curvilinear segment is semicircular.

19. The device of claim 17, wherein the display area is round.

20. The device of claim 17, wherein the border area is annular.

21. The device of claim 17, wherein the border area has a width and, for a first diameter substrate, the width of the border area is reduced by increasing a value of N.

22. The device of claim 17, further comprising a display driver, wherein each of the N groups of connection pads is coupled to the display driver via the N arms of the flexible circuit board.

23. The device of claim 17, wherein each of the N arms includes only one fold, parallel to a corresponding facet, to facilitate wrapping the N arms around the edge of the substrate and positioning the flexible circuit board adjacent to a backside of the substrate, before the N arms are coupled to the N groups of connection pads.

24. The device of claim 17, wherein each of the N arms includes one fold parallel to a corresponding facet and a plurality of non-parallel folds, to facilitate wrapping the N arms around the edge of the substrate and positioning the flexible circuit board adjacent to a backside of the substrate after the N arms are coupled to the N groups of connection pads.

25. A device, comprising:

a substrate having an outer perimeter;

a plurality of pixels on a first side of the substrate, within a display area;

a plurality of first connection pads on the first side of the substrate, within an annular border area peripheral to the display area and adjacent to the outer perimeter, the plurality of pixels coupled to the plurality of first connection pads; and

a flexible circuit board including;

a first portion including a plurality of second connection pads configured to be coupled to corresponding ones of the plurality of first connection pads, the first portion having a shape that corresponds to a segment of the annular border area, and

a second portion configured to accommodate a plurality of transmission lines extending from the second connection pads, wherein the plurality of transmission lines are routed on and/or in the first portion to the second portion, occupy an area on and/or within the second portion, and an are length of the first portion is greater than an are length of the second portion,

wherein a center-to-center pitch of the plurality of second connection pads in the first portion is greater than a center-to-center pitch of the plurality of transmission lines in the area on and/or within the second portion.

26. The device of claim 25, wherein the outer perimeter is round.

27. The device of claim 25, wherein the outer perimeter includes a curvilinear segment adjoined to a facet, and the second portion is configured to wrap around an edge of the substrate adjacent to the facet.

28. The device of claim 25, wherein the display area is round.

29. The device of claim 25, wherein an edge of the first portion, which is proximal to an edge of the display area, extends to the edge of the display area.

30. The device of claim 25, wherein an edge of the first portion, which is proximal to an edge of the display area, extends into a frit border of the substrate.