Display panel having individual display devices bonded to light transmitting plates which have a combined area greater than of the devices

• US 5,875,010 A
• Filed: 02/20/1997
• Issued: 02/23/1999
• Est. Priority Date: 02/20/1997
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Stone, David B., Quinn, deceased, Anne M., Gaynes, Michael A., Pierson, Mark V., Baechtle, Jeffrey C.
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): TON, MINH TOAN T
• Application Number:
  US08/803,097
• Time in Patent Office: 733 Days
• Field of Search: 349/73, 349/153
• US Class Current: 349/73
• CPC Class Codes: G02F 1/13336 Combining plural substrates to produce large-area displays, e.g. tiled displays
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells

Abstract

A display panel and method of making same in which the panel comprises a plurality of display devices mounted between light-transmitting plates. The structure includes clear and opaque bonding materials positioned to retain alignment and provide acceptable brightness, contrast, and resolution while holding the display devices in contact with the light-transmitting plates.

Claims

1. A display panel comprising:

a first light-transmitting plate having first and second surfaces;

a plurality of display devices of substantially uniform thickness and having a combined area less than the area of said first light-transmitting plate, each display device having first and second surfaces, said first surfaces of said display devices facing said first surface of said first light transmitting plate;

a first layer of bonding material in contact with said first surface of said first light-transmitting plate and said first surfaces of said display devices to hold said display devices in position relative to each other on said first light-transmitting plate;

a second light-transmitting plate having an area greater than said combined area of said plurality of display devices, and having first and second surfaces, said first surface facing said second surfaces of said display devices; and

a second layer of bonding material located between and in contact with said first surface of said second light-transmitting plate and said second surfaces of said display devices to hold said second light-transmitting plate in contact with said display devices.

2. The display panel of claim 1 in which said first light-transmitting plate is comprised of glass.

3. The display panel of claim 2 in which said glass is a display grade unannealed material.

4. The display panel of claim 2 in which said second light-transmitting plate is comprised of glass.

5. The display panel of claim 4 in which said glass is a display grade unannealed material.

6. The display panel of claim 1 in which selected ones of said display devices comprise liquid crystal display devices.

7. The display panel of claim 1 in which said first layer of bonding material is optically transparent.

8. The display panel of claim 7 in which said first layer of bonding material comprises an adhesive sheet.

9. The display panel of claim 8 in which said first layer of bonding material is U.V. curable.

10. The display panel of claim 8 in which said first layer of bonding material is heat curable.

11. The display panel of claim 7 in which said second layer of bonding material is optically transparent.

12. The display panel of claim 11 in which said second layer of bonding material comprises an adhesive sheet.

13. The display panel of claim 12 in which said second layer of bonding material is U.V. curable.

14. The display panel of claim 12 in which said second layer of bonding material is heat curable.

15. The display panel of claim 1 in which said second layer of bonding material is located substantially only along at least one outer edge portion of each of said display devices.

16. The display panel of claim 1 in which said second layer of bonding material comprises an adhesive.

17. The display panel of claim 16 in which said second layer of bonding material is U.V. curable.

18. The display panel of claim 16 in which said second layer of bonding material is heat curable.

19. The display panel of claim 1 in which said display devices are positioned on said first light-transmitting plate in a continuous abutting pattern.

20. The display panel of claim 1 in which the ratio of said substantially uniform thickness of said display devices to the thickness of said first light-transmitting plate is within the ratio of about 2:

1.

21. The display panel of claim 1 further including a light source positioned adjacent said second surface of said first light-transmitting plate for projecting light onto said first light-transmitting plate, said light passing through said first light-transmitting plate and said first layer of bonding material to illuminate said display devices.

22. The display panel of claim 1, further comprising a seal material positioned about the periphery and between said first and second light transmitting plates to prevent dust, moisture, or other contaminates from entering said display panel after assembly.

23. A method of making a display panel comprising the steps of:

a. providing a first light transmitting plate having a first surface;

b. placing a first layer of bonding material on said first surface of said first light-transmitting plate;

c. locating a plurality of display devices having a combined area less than the area of said first light transmitting plate, each display device having first and second surfaces on said first layer of bonding material with said first surfaces of said display devices in contact with said first layer of bonding material;

d. curing said first layer of bonding material to hold said display devices in position on said first layer of bonding material relative to said first light-transmitting plate;

e. placing a second layer of bonding material in contact with said second surfaces of said display devices;

f. providing a second light-transmitting plate having an area greater than said combined area of said plurality of display devices, and having a first surface;

g. placing said first surface of said second light-transmitting plate in contact with said second layer of bonding material; and

h. curing said second layer of bonding material.

24. The method of claim 23 in which said locating of said plurality of display devices comprises the steps of providing alignment means on said display devices and said first light-transmitting plate and then aligning said devices and said light-transmitting plate through said first layer of bonding material.

25. The method of claim 23 in which said curing of said first layer of bonding material is accomplished using ultraviolet radiation.

26. The method of claim 23 in which said curing of said first layer of bonding material is accomplished using heat.

27. The method of claim 25 in which said curing of said second layer of bonding material is accomplished using ultraviolet radiation.

28. The method of claim 26 in which said curing of said second layer of bonding material is accomplished using heat.