Integrated liquid crystal display and backlight system for an electronic apparatus

• US 5,754,159 A
• Filed: 11/20/1995
• Issued: 05/19/1998
• Est. Priority Date: 11/20/1995
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Wood, Anthony B., Faris, Jeffrey E.
• Primary Examiner(s): Bayerl, Raymond J.
• Assistant Examiner(s): Vail, Seth D.
• Application Number:
  US08/560,188
• Time in Patent Office: 911 Days
• Field of Search: 345/65, 345/102, 313/514, 313/496, 313/485, 349/112, 349/160, 349/62, 445/24, 445/25
• US Class Current: 345/102
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

An integrated liquid crystal display and backlight system for generating video images for a portable computer (12) comprising a top glass (32), a bottom glass (34) and a thin film transistor and liquid crystal layer (36) disposed therebetween, a diffuser (38) bonded to the bottom glass (34) on the side opposite the top glass (32), a substrate (40) bonded to the diffuser (38) opposite the bottom glass (34) having an array of semispherical cavities (42) each having an aluminized surface (44), a phosphor layer (46) coating the aluminized surfaces (44), an array of indium tin oxide conductors (48) electrically connected to the aluminized surfaces (44) and disposed within the cavities (42), and a volume of mercury gas (50) filling the cavities (42) such that when a voltage (54) is established between the aluminized surfaces (44) and the indium tin oxide conductors (48), the phosphor (46) becomes excited and produces backlight for the liquid crystal display system (26).

Claims

1. An integrated liquid crystal display and backlight system for a portable computer comprising:

a liquid crystal display;

a flat panel backlight disposed in parallel with said liquid crystal liquid crystal display, said flat panel backlight further comprising;

a diffuser bonded to said liquid crystal display;

a substrate having an array of semispherical cavities bonded to said diffuser opposite said liquid crystal display;

an aluminized surface coating said semispherical cavities;

a phosphor layer coating said aluminized surface;

a conductor layer electrically connected to said aluminized surface and disposed within said cavities; and

a volume of dischargeable gas filling said cavity such that when a voltage is established between said aluminized surface and said conductor layer said phosphor becomes excited and produces backlight for said liquid crystal display system.

2. The integrated liquid crystal display and backlight system as recited in claim 1 wherein said conductor layer further includes an array of conductors, each of said conductors corresponding to one of said semispherical cavities in said array of semispherical cavities.

3. The integrated liquid crystal display and backlight system as recited in claim 2 wherein said voltage between each of said conductors and said aluminized surfaces of said corresponding semispherical cavities is independently controllable.

4. The integrated liquid crystal display and backlight system as recited in claim 1 wherein said conductor layer further includes a plurality of conductor strips, each of said conductor strip corresponding to one row of said semispherical cavities in said array of semispherical cavities.

5. The integrated liquid crystal display and backlight system as recited in claim 4 wherein said voltage between each of said conductor strips and said aluminized surfaces of said corresponding row of semispherical cavities is independently controllable.

6. An integrated liquid crystal display and backlight system for a portable computer comprising:

a liquid crystal display;

a flat panel backlight disposed in parallel with said liquid crystal liquid crystal display, said flat panel backlight further comprising;

a diffuser bonded to said liquid crystal display;

a substrate having a plurality of cylindrical cavities bonded to said diffuser opposite said liquid crystal display;

an aluminized surface coating said plurality of cylindrical cavities;

a phosphor layer coating said aluminized surface;

a plurality of conductor strips, each of said conductor strips corresponding to one cylindrical cavity of said plurality of cylindrical cavities, each conductor strip electrically connected to said aluminized surface and disposed within a respective cavity; and

a volume of dischargeable gas filling said cavity such that when a voltage is established between said aluminized surface and one of said conductor strips, said phosphor becomes excited and produces backlight for said liquid crystal display system.

7. The integrated liquid crystal display and backlight system as recited in claim 6 wherein said voltage between each of said conductor strips and said aluminized surface of said corresponding cylindrical cavity is independently controllable.

8. An integrated liquid crystal display and backlight system for a portable computer comprising:

a liquid crystal display including a top glass and a bottom glass having a cavity on the side opposite said top glass; and

a flat panel backlight disposed in parallel with said liquid crystal display, said flat panel backlight further including;

a cover bonded to said bottom glass opposite said top glass providing a seal;

an aluminized surface coating said cover;

a phosphor layer coating said aluminized surface;

a conductor layer electrically connected to said aluminized surface and disposed within said cavity;

a volume of dischargeable gas filling said cavity such that when a voltage is established between said aluminized surface and said conductor layer said phosphor becomes excited and produces backlight for said liquid crystal display system; and

at least one fresnel lens etched on said bottom glass in said cavity.

9. A flat panel backlight for a liquid crystal display comprising:

a substrate having an array of semispherical cavities;

an aluminized surface coating said semispherical cavities;

a cover bonded to said substrate providing a boundary for said semishperical cavities;

a phosphor layer disposed within said cavities;

a conductor layer electrically connected to said aluminized surface and disposed within said cavities; and

a volume of dischargeable gas filling said cavity such that when a voltage is established between said aluminized surface and said conductor layer said phosphor becomes excited and produces light.

10. The flat panel backlight as recited in claim 9 wherein said conductor layer further includes an array of conductors, each of said conductors corresponding to one of said semispherical cavities in said array of semispherical cavities.

11. The flat panel backlight as recited in claim 10 wherein said voltage between each of said conductors and said aluminized surfaces of said corresponding semispherical cavities is independently controllable.

12. The flat panel backlight as recited in claim 9 wherein said conductor layer further includes a plurality of conductor strips, each of said conductor strip corresponding to one row of said semispherical cavities in said array of semispherical cavities.

13. The flat panel backlight as recited in claim 12 wherein said voltage between each of said conductor strips and said aluminized surfaces of said corresponding row of semispherical cavities is independently controllable.

14. The flat panel backlight as recited in claim 9 wherein said cover is a diffuser.

15. A flat panel backlight for a liquid crystal display comprising:

a substrate having a plurality of cylindrical cavities;

an aluminized surface coating said cylindrical cavities;

a cover bonded to said substrate providing a boundary for said cylindrical cavities;

a phosphor layer disposed within said cavities;

a plurality of conductor strips, each of said conductor strips corresponding to one cylindrical cavity of said plurality of cylindrical cavities, each conductor strip electrically connected to said aluminized surface and disposed within a respective cavity; and

a volume of dischargeable gas filling said cavity such that when a voltage is established between said aluminized surface and said conductor layer said phosphor becomes excited and produces light.

16. The flat panel backlight as recited in claim 15 wherein said voltage between each of said conductor strips and said aluminized surface of said corresponding cylindrical cavity is independently controllable.

17. A method for generating backlight for a liquid crystal display comprising:

providing a flat panel substrate;

forming an array of spherical cavities in said flat panel substrate;

aluminizing the surface of said cavities;

coating said aluminized surface with phosphor;

bonding a conductor to a diffuser;

filling said cavities with a dischargeable gas; and

bonding said diffuser to said flat panel substrate.

18. The method for generating backlight as recited in claim 17 further including the steps of:

applying a voltage between said aluminized surface and said conductor;

discharging said dischargeable gas;

exciting said phosphor; and

generating said backlight.

19. A method for generating backlight for a liquid crystal display comprising:

providing a liquid crystal display having a top glass, a bottom glass disposed in parallel with said top glass and a thin film transistor and liquid crystal layer between said top glass and said bottom glass;

forming a cavity in said bottom glass on the side opposite said top glass;

etching at least one fresnel lens on said bottom glass in said cavity;

attaching a cover to said bottom glass on the side opposite said top glass;

aluminizing the surface of said cover;

coating said aluminized surface with phosphor;

bonding a conductor or layer to said bottom glass within said cavity; and

filling said cavity with a dischargeable gas.

20. The method for generating backlight as recited in claim 19 further including the steps of:

applying a voltage between said aluminized surface and said conductor;

discharging said dischargeable gas;

exciting said phosphor; and

generating said backlight.

21. A monitor for an electronic apparatus, comprising:

a liquid crystal display;

a flat panel backlight disposed in parallel with said liquid crystal liquid crystal display, said flat panel backlight further comprising;

a diffuser bonded to said liquid crystal display;

a substrate having a plurality of semispherical cavities bonded to said diffuser opposite said liquid crystal display;

an electrically conductive surface coating said semispherical cavities;

a phosphor layer coating said electrically conductive surface;

a conductor layer electrically connectable to said electrically conductive surface and disposed within said cavities; and

a volume of dischargeable gas filling said cavity such that when a voltage is established between said electrically conductive surface and said conductor layer said phosphor becomes excited and produces backlight for said liquid crystal display system.

22. The monitor of claim 21 wherein said plurality of semispherical cavities are oriented in an array of semispherical cavities.

23. The monitor of claim 21 wherein said electrically conductive surface is formed of one of gold, aluminum or copper.

24. The monitor of claim 21 wherein said electrically conductive surface is further light reflective.

25. The monitor of claim 21 wherein said electrically conductive surface is transparent.

26. A monitor for an electronic apparatus, comprising:

a liquid crystal display;

a flat panel backlight disposed in parallel with said liquid crystal liquid crystal display, said flat panel backlight further comprising;

a diffuser bonded to said liquid crystal display;

a substrate having a plurality of cylindrical cavities bonded to said diffuser opposite said liquid crystal display;

an electrically conductive surface coating said plurality of cylindrical cavities;

a phosphor layer coating said electrically conductive surface;

a plurality of conductor strips, each of said conductor strips corresponding to one cylindrical cavity of said plurality of cylindrical cavities, each conductor strip electrically connectable to said electrically conductive surface and disposed within a respective cavity; and

a volume of dischargeable gas filling said cavity such that when a voltage is established between said aluminized surface and one of said conductor strips, said phosphor becomes excited and produces backlight for said liquid crystal display system.

27. The monitor of claim 26 wherein said electrically conductive surface is formed of one of gold, aluminum or copper.

28. The monitor of claim 26 wherein said electrically conductive surface is further light reflective.

29. The monitor of claim 26 wherein said electrically conductive surface is transparent.