Light emission device and display device

• US 7,663,297 B2
• Filed: 03/22/2007
• Issued: 02/16/2010
• Est. Priority Date: 05/19/2006
• Status: Expired due to Fees

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Ryu, Kyung-Sun, Jung, Kyu-Won, Lee, Sang-Jin, Lee, Jin-Ho, Jun, Pil-Goo, Shin, Jong-Hoon, Kang, Su-Joung
• Primary Examiner(s): Williams; Joseph L
• Assistant Examiner(s): Lee; Brenitra M
• Application Number:
  US11/690,083
• Publication Number:
  US 20070267961A1
• Time in Patent Office: 1,062 Days
• Field of Search: 313/495, 313/496, 313/497, 313309-310, 445 23- 25
• US Class Current: 313/495
• CPC Class Codes: H01J 29/06 Screens for shielding; Masks interposed in the electron stream
• CPC Class Codes: H01J 29/481 Electron guns using field-emission, photo-emission, or secondary-emission electron source
• CPC Class Codes: H01J 31/127 using large area or array sources, i.e. essentially a source for each pixel group

Abstract

A light emission device and a display device using the light emission device as a light source are provided. The light emission device includes a vacuum envelope formed by first and second substrates and a sealing member, first electrodes formed on the first substrate in a first direction, an insulating layer formed on the first substrate and covering the first electrodes, second electrodes formed on the insulating layer in a second direction crossing the first direction, electron emission regions electrically connected to the first electrodes or the second electrodes, a resistive layer for covering a first surface of the insulating layer, the first surface facing the second substrate, a phosphor layer formed on the second substrate, and an anode electrode formed on the phosphor layer.

Claims

1. A light emission device comprising:

a vacuum envelope formed by first and second substrates and a sealing member;

first electrodes on the first substrate in a first direction;

an insulating layer on the first substrate and covering the first electrodes;

second electrodes on a portion of the insulating layer in a second direction crossing the first direction;

electron emission regions electrically connected to one of the first and second electrodes;

a resistive layer for covering a first surface of the insulating layer, the first surface facing the second substrate, wherein the resistive layer electrically contacts the second electrodes;

a phosphor layer on the second substrate; and

an anode electrode on the phosphor layer.

2. The light emission device of claim 1, wherein the resistive layer is on a first portion of the first surface of the insulating layer, the first portion excluding the second electrodes.

3. The light emission device of claim 1, wherein the resistive layer covers the entire first surface of the insulating layer.

4. The light emission device of claim 3, wherein openings are through the second electrodes and the insulating layer at overlapping regions of the first and second electrodes;

the electron emission regions are on the first electrodes through the openings; and

the resistive layer is on sidewalls of the openings of the insulating layer.

5. The light emission device of claim 1, further comprising a second resistive layer on an inner surface of the sealing member.

6. The light emission device of claim 1, wherein the resistive layer has a resistance substantially within a range of 10⁶-10¹² Ω

cm.

7. The light emission device of claim 1, wherein a ground voltage or a negative DC voltage is applied to the resistive layer.

8. The light emission device of claim 1, wherein the resistive layer is above the insulating layer and the second electrodes with a second insulating layer disposed therebetween and openings through which electron beams pass through the second insulating layer.

9. The light emission device of claim 8, wherein the resistive layer has a resistance substantially within a range of 10⁶-10¹² Ω

cm.

10. The light emission device of claim 1, wherein the electron emission regions are a material including at least one of a carbon-based material and a nanometer-sized material.

11. The light emission device of claim 1, wherein the first and second substrates are spaced apart from each other by a distance substantially within a range of 5-10 mm and the light emission device further comprises an anode voltage applying unit applying a direct current voltage substantially within a range of 10-15 kV to the anode electrode.

12. A light emission device comprising:

a vacuum envelope formed by first and second substrates and a sealing member;

first electrodes on the first substrate in a first direction;

an insulating layer on the first substrate and covering the first electrodes;

second electrodes on a portion of the insulating layer in a second direction crossing the first direction;

electron emission regions electrically connected to one of the first and second electrodes;

a resistive layer for covering a first surface of the insulating layer, the first surface facing the second substrate;

a phosphor layer on the second substrate;

an anode electrode on the phosphor layer; and

a conductive layer on an edge of the insulating layer and spaced away from the second electrodes, wherein the resistive layer is on a first portion of the insulating layer, the first portion of the insulating layer facing the second substrate and excluding the second electrodes and the conductive layer.

13. The light emission device of claim 12, further comprising a second resistive layer on an inner surface of the sealing member, wherein the second resistive layer is electrically connected to the conductive layer through a conductive adhesive layer.

14. A display device comprising:

a display panel for displaying an image;

a light emission device for emitting light toward the display panel,

wherein the light emission device comprises;

a vacuum envelope formed by first and second substrates and a sealing member;

an electron emission unit including first electrodes on the first substrate in a first direction, an insulating layer on the first substrate and covering the first electrodes, second electrodes on a portion of the insulating layer in a second direction crossing the first direction, electron emission regions electrically connected to one of the first and second electrodes, and a resistive layer for covering a first surface of the insulating layer, the first surface facing the second substrate, wherein the resistive layer electrically contacts the second electrodes; and

a light emission unit including a phosphor layer on the second substrate and an anode electrode on the phosphor layer.

15. The display device of claim 14, wherein the resistive layer is on a first portion of the first surface of the insulating layer, the first portion excluding the second electrodes.

16. The display device of claim 14, wherein the resistive layer covers the entire first surface of the insulating layer.

17. The display device of claim 14, further comprising a second resistive layer on an inner surface of the sealing member.

18. The display device of claim 14, wherein the resistive layer has a resistance substantially within a range of about 10⁶-10¹² Ω

cm.

19. The display device of claim 14, wherein the resistive layer is above the insulating layer and the second electrodes with a second insulating layer disposed therebetween and openings through which electron beams pass through the resistive layer and the second insulating layer.

20. The display device of claim 14, wherein the display panel includes first pixels and the light emission device includes second pixels, wherein the number of the second pixels is less than that of the first pixels and light emission intensities of the second pixels are independently controlled.

21. The display device of claim 14, wherein the display panel is a liquid crystal display panel.

22. A display device comprising:

a display panel for displaying an image;

a light emission device for emitting light toward the display panel,

wherein the light emission device comprises;

a vacuum envelope formed by first and second substrates and a sealing member;

an electron emission unit including first electrodes on the first substrate in a first direction, an insulating layer on the first substrate and covering the first electrodes, second electrodes on a portion of the insulating layer in a second direction crossing the first direction, electron emission regions electrically connected to one of the first and second electrodes, and a resistive layer for covering a first surface of the insulating layer, the first surface facing the second substrate;

a light emission unit including a phosphor layer on the second substrate and an anode electrode on the phosphor layer; and

a conductive layer on an edge of the insulating layer and spaced away from the second electrodes, wherein the resistive layer is on a first portion of the insulating layer, the first portion of the insulating layer facing the second substrate and excluding the second electrodes and the conductive layer.