SYSTEM AND METHOD FOR MANUFACTURING A DISPLAY PANEL OR OTHER PATTERNED DEVICE

• US 20130083457A1
• Filed: 11/30/2011
• Published: 04/04/2013
• Est. Priority Date: 09/30/2011
• Status: Abandoned Application

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Wurzel, Joshua Grey, Bi, Yafei, Yao, Wei H.
• Application Number:
  US13/308,074
• Publication Number:
  US 20130083457A1
• Time in Patent Office: Days
• US Class Current: 361/679.01
• CPC Class Codes: G02F 1/1309 Repairing; Testing
• CPC Class Codes: G06F 1/1601 Constructional details related to the housing of computer displays, e.g. of CRT monitors, of flat displays constructional details related to flat displays integrated in a portable computer, e.g. laptop, handheld computer G06F1/1637; constructional details related to television receivers H04N5/64
• 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 11/0742 in a data processing system embedded in a mobile device, e.g. mobile phones, handheld devices
• CPC Class Codes: G06F 11/0769 Readable error formats, e.g. cross-platform generic formats, human understandable formats
• CPC Class Codes: G06F 11/0772 Means for error signaling, e.g. using interrupts, exception flags, dedicated error registers
• CPC Class Codes: G06F 11/3044 where the computing system component is the mechanical casing of the computing system
• CPC Class Codes: G06F 11/3058 Monitoring arrangements for monitoring environmental properties or parameters of the computing system or of the computing system component, e.g. monitoring of power, currents, temperature, humidity, position, vibrations thermal management in cooling arrangements of a computing system G06F1/206
• CPC Class Codes: G06F 11/327 Alarm or error message display
• CPC Class Codes: G06F 2200/1612 Flat panel monitor
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2330/12 Test circuits or failure detection circuits included in a display system, as permanent part thereof
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: Y10T 29/49004 including measuring or testing of device or component part

Abstract

Systems and methods for manufacturing a display panel or other patterned device using outer resistive trace(s) patterned on the display panel or other patterned device are provided. Such a system, for example, may include resistance detection circuitry, a grinder, and data processing circuitry. The resistance detection circuitry may detect a resistance of a resistive trace disposed around a display panel. The grinder may grind a first edge of the display panel such that at least part of the resistive trace is grinded away as the first edge of the display panel is grinded. The data processing circuitry may control the grinder to stop grinding the first edge of the display panel when the resistance of the at least one resistive trace increases to a particular resistance value.

Claims

1. A system comprising:

resistance detection circuitry configured to detect a resistance of at least one resistive trace disposed around a display panel;

a grinder configured to grind a first edge of the display panel such that at least part of the at least one resistive trace is grinded away as the first edge of the display panel is grinded; and

data processing circuitry configured to control the grinder to cause the grinder to stop grinding the first edge of the display panel when the resistance of the at least one resistive trace increases to a first resistance value.

2. The system of claim 1, wherein the resistance detection circuitry comprises circuitry external to the display panel and comprises at least two probes configured to detect the resistance of the at least one resistive trace.

3. The system of claim 1, wherein the resistance detection circuitry comprises circuitry disposed on the display panel, wherein the circuitry disposed on the display panel is configured to output a value of the measured resistance to the data processing circuitry.

4. The system of claim 1, wherein the at least one resistive trace comprises a plurality of resistive traces connected in parallel and wherein the data processing circuitry is configured to cause the grinder to stop grinding the first edge of the display panel when one of the plurality of resistive traces is grinded away causing the resistance of the at least one resistive trace to increase to the first resistance value.

5. The system of claim 1, wherein the at least one resistive trace comprises only a single resistive trace configured to vary in resistance depending on its width, wherein the data processing circuitry is configured to cause the grinder to stop grinding the first edge of the display panel when the width of the single resistive trace at the first edge is grinded away to the point that the resistance of the single resistive trace increases to the first resistance value.

6. A method of manufacturing a display panel comprising:

patterning at least one resistive trace at least partially on a dead zone around or near edges of a display panel;

detecting a resistance of the at least one resistive trace; and

while the resistance is being detected at least occasionally, grinding a first edge of the display panel until the at least one resistive trace reaches a first target resistance, wherein the first target resistance corresponds to a specified amount of grinding down of the first edge.

7. The method of claim 6, wherein the at least one resistive trace is patterned at the same time an element of an active area of the display panel is patterned.

8. The method of claim 6, wherein detecting the resistance of the at least one resistive trace comprises measuring only a first segment of the at least one resistive trace disposed at or near the first edge.

9. The method of claim 6, wherein detecting the resistance of the at least one resistive trace comprises measuring the resistance of the entirety of the at least one resistive trace.

10. The method of claim 6, wherein the resistance is detected using resistance test circuitry, wherein the resistance test circuitry is external to the display panel and connected to the at least one resistive trace via probes.

11. The method of claim 6, wherein the resistance is detected using resistance test circuitry disposed on the display panel and configured to output a digital or analog value associated with the resistance of the at least one resistive trace.

12. The method of claim 6, comprising, while the resistance is being detected:

grinding a second edge of the display panel until the at least one resistive trace reaches a second target resistance higher than the first target resistance, wherein the second target resistance corresponds to a specified amount of grinding down of the first edge and the second edge;

grinding a third edge of the display panel until the at least one resistive trace reaches a third target resistance higher than the second target resistance, wherein the third target resistance corresponds to a specified amount of grinding down of the first edge, the second edge, and the third edge; and

grinding a fourth edge of the display panel until the at least one resistive trace reaches a fourth target resistance higher than the third target resistance, wherein the fourth target resistance corresponds to a specified amount of grinding down of the first edge, the second edge, the third edge, and the fourth edge.

13. A display panel manufactured according to the method of claim 12.

14. A system comprising:

test circuitry configured to detect a change in a relationship between a resistance of a first segment and resistances of other segments of at least one resistive trace, wherein the at least one resistive trace is disposed near edges of a display panel and wherein the first segment of the at least one resistive trace is disposed near a first edge of the display panel, wherein the test circuitry is configured to detect the change in the relationship between the resistance of the first segment and the resistances of the other segments by way of a wheatstone bridge circuit that is configured to use different segments of the at least one resistive trace as different resistances of the wheatstone bridge circuit;

a grinder configured to grind the first edge of the display panel such that at least part of the first segment of the at least one resistive trace is grinded away as the first edge of the display panel is grinded; and

data processing circuitry configured to control the grinder to cause the grinder to stop grinding the first edge of the display panel when the test circuitry detects that the change in the relationship between the resistance of the first segment and the resistances of the other segments reaches a first target value.

15. The system of claim 14, wherein the wheatstone bridge circuit is configured to use the first segment of the at least one resistive trace disposed around the first edge of the display panel as a first resistance, a second segment of the at least one resistive trace disposed around a second edge of the display panel as a second resistance, a third segment of the at least one resistive trace disposed around a third edge of the display panel as a third resistance, and a fourth segment of the at least one resistive trace disposed around a fourth edge of the display panel as a fourth resistance.

16. The system of claim 15, wherein the wheatstone bridge circuit is configured to detect the change in the relationship, wherein the relationship indicates a difference between the first resistance over the second resistance relative to the third resistance over the fourth resistance, wherein the first target value of the change in the relationship indicates the first resistance has changed a resistance value indicative of the first edge being grinded a specified amount.

17. The system of claim 15, wherein the wheatstone bridge circuit is configured to indicate that the first resistance, the second resistance, the third resistance, and the fourth resistance are balanced before the first edge is grinded and to indicate the change in the relationship as the first edge is grinded down.

18. The system of claim 14, wherein the test circuitry comprises a comparator circuit configured to compare output voltages of the wheatstone bridge circuit and provide a difference between the output voltages of the wheatstone bridge circuit, wherein the difference indicates the relationship between the resistance of the first segment and resistances of the other segments of the at least one resistive trace.

19. The system of claim 14, wherein the test circuitry is configured to determine digital values associated with output voltages of the wheatstone bridge circuit using comparator circuits configured to compare the output voltages of the wheatstone bridge circuit to digital values that have been converted to analog values, wherein the digital values are approximately equal to the output voltages of the wheatstone bridge circuit when the outputs of the comparator circuits are substantially zero.

20. A method comprising:

determining a proportional relationship between resistances of a first segment, second segment, third segment, and fourth segment of at least one resistive trace disposed on a display panel, wherein the first segment is disposed near a first edge of the display panel, the second segment is disposed near a second edge of the display panel, the third segment is disposed near a third edge of the display panel, and the fourth segment is disposed near a fourth edge of the display panel;

grinding the first edge of the display panel until the proportional relationship reaches a first target value associated with a specified amount of grinding of the first edge of the display panel;

grinding the second edge of the display panel until the proportional relationship reaches a second target value associated with a specified amount of grinding of the first edge and the second edge of the display panel;

grinding the third edge of the display panel until the proportional relationship reaches a third target value associated with a specified amount of grinding of the first edge, the second edge, and the third edge of the display panel; and

grinding the fourth edge of the display panel until the proportional relationship reaches a fourth target value associated with a specified amount of grinding of the first edge, second edge, third edge, and fourth edge of the display panel.

21. The method of claim 20, determining a proportional relationship between resistances of the first segment, second segment, third segment, and fourth segment of the at least one resistive trace comprises sensing output voltages of a wheatstone bridge circuit formed using the first segment disposed between a first node and a second node, the second segment disposed between the second node and a third node, the third segment disposed between the third node and a fourth node, the fourth segment disposed between the first node and the fourth node, and a known resistance disposed between the second node and the fourth node, when an input voltage is applied across the first node and the third node, wherein the output voltages of the wheatstone bridge circuit are sensed at the second node and the fourth node, respectively.

22. The method of claim 21, wherein the proportional relationship is determined by comparing the output voltages respectively sensed at the second node and the fourth node.

23. The method of claim 21, wherein the proportional relationship is determined such that a relationship of the resistances of the first segment divided over the second segment relative to the fourth segment divided over the third segment is approximately 1:

1 before the first edge is grinded and after the fourth edge is grinded.

24. A method of manufacturing a display panel to specified dimensions comprising:

patterning a plurality of resistive traces at least partially in a dead zone near edges of a display panel;

grinding a first of the edges of the display panel until a first of the resistive traces is at least partially grinded away;

grinding a second of the edges of the display panel until the first and a second of the resistive traces are at least partially grinded away;

grinding a third of the edges of the display panel until the first, the second, and a third of the resistive traces are at least partially grinded away; and

grinding a fourth of the edges of the display panel until the first, the second, the third, and a fourth of the resistive traces are at least partially grinded away;

wherein the first, second, third, and fourth of the edges of the display panel are grinded such that the display panel is sized to within a tolerance of the specified dimensions.

25. The method of claim 24, wherein grinding the first of the edges comprises grinding the first of the edges such that the first of the resistive traces is at least partially grinded away but the second, third, and fourth of the resistive traces remain fully intact.

26. The method of claim 25, wherein grinding the second of the edges comprises grinding the second of the edges such that the first and second of the resistive traces are at least partially grinded away but the third and fourth of the resistive traces remain fully intact.

27. A method comprising:

patterning at least one resistive trace around or near edges of a patterned device;

detecting a resistance of the at least one resistive trace; and

while the resistance is being at least occasionally detected, successively cutting a first edge of the display panel until the at least one resistive trace reaches a first target resistance, wherein the first target resistance corresponds to a specified amount of cutting away from the first edge.

28. The method of claim 27, wherein the patterned device comprises a display panel, a touch sensor panel, a flexible printed circuit, or a printed circuit board, or a combination thereof.

29. The method of claim 27, wherein the patterned device comprises a flexible printed circuit and wherein the flexible printed circuit is cut at least in part by die-punching.

30. The method of claim 27, wherein the patterned device comprises a printed circuit board and wherein the printed circuit board is cut at least in part by drilling out the printed circuit board.