Device for producing an image

• US 6,964,489 B2
• Filed: 10/15/2002
• Issued: 11/15/2005
• Est. Priority Date: 09/27/2002
• Status: Expired due to Fees

• Current Assignee: Star Company Led Technologies LLC (Star Company Scientific Technologies Advanced Research Company LLC)
• Original Assignee: Siemens AG
• Inventors: Mayer, Ralf, Blume, Heinrich-Jochen, Hohmann, Kai, Noll, Heinrich, Brohm, Thomas
• Primary Examiner(s): Husar, Stephen F
• Application Number:
  US10/271,621
• Publication Number:
  US 20040062040A1
• Time in Patent Office: 1,127 Days
• Field of Search: 362/27, 362/31, 362/29, 362/97, 362/231, 362/800, 349/11, 349/61, 349/62
• US Class Current: 362/27
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48472 the other connecting portion not on the bonding area also being a wedge bond, i.e. wedge-to-wedge
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

In a device for producing an image with a high light intensity by an image reproduction apparatus (9) which contains light valves, a light source comprising a light-emitting diode matrix (1, 2, 3) is provided for background lighting of the image reproduction apparatus (9). An optical device (5, 8, 10) for focussing and scattering the light which is produced by the light-emitting diode (1) is arranged between the light source (1, 2, 3) and the image reproduction apparatus (9).

Claims

1. A device for producing an image with an image reproduction apparatus (9) which contains light valves, comprising:

a light source comprising a light-emitting diode matrix (1, 2, 3) of light-emitting diodes provided for background lighting of the image reproduction apparatus (9), and an optical device for focussing and scattering light produced by the light-emitting diodes that is arranged between the light source and the image reproduction apparatus;

wherein one matrix point is in each case formed by a number of the light-emitting diodes (1);

four light-emitting diodes (1) form one matrix point; and

wherein two green light-emitting diodes and two red light-emitting diodes are provided for each matrix point.

2. A device for producing an image with an image reproduction apparatus (9) which contains light valves, comprising:

a light source comprising a light-emitting diode matrix (1, 2, 3) of light-emitting diodes provided for background lighting of the image reproduction apparatus (9), and an optical device for focussing and scattering light produced by the light-emitting diodes that is arranged between the light source and the image reproduction apparatus; and

wherein the light valves have associated color filters (14) with different spectral passbands, with the passbands of the colored filters (14) being matched to spectral light distribution of the light-emitting diodes (1).

3. The device as claimed in claim 2, wherein one matrix point is in each case formed by a number of the light-emitting diodes (1).

4. The device as claimed in claim 3, wherein the light-emitting diodes (1) of each matrix point emit different colored light.

5. The device as claimed in claim 3, wherein four light-emitting diodes (1) form one matrix point.

6. The device as claimed in claim 5, wherein two green light-emitting diodes (1), one blue light-emitting diode and one red light-emitting diode (1) are provided for each matrix point.

7. The device as claimed in claim 3, wherein the matrix points are surrounded by in each case one reflector (3, 24).

8. The device as claimed in claim 2, wherein at least one green filter has a passband which also detects parts of the spectral bands of red and green light-emitting diodes (1).

9. A device for producing an image with an image reproduction apparatus (9) which contains light valves, comprising:

a light source comprising a light-emitting diode matrix (1, 2, 3) of light-emitting diodes provided for background lighting of the image reproduction apparatus (9), and an optical device for focussing and scattering light produced by the light-emitting diodes that is arranged between the light source and the image reproduction apparatus;

wherein one matrix point is in each case formed by a number of the light-emitting diodes (1); and

wherein the device for focussing and scattering comprises a reflector (5) which is in a form of a grid and forms a light channel for each matrix point, and walls (6) of the light channel are reflective.

10. The device as claimed in claim 9, wherein the device for focussing and scattering furthermore comprises a scatter disc, which is arranged between the reflector (5), which is in the form of the grid, and the image reproduction apparatus (9), with a distance being provided between the reflector (5) and the scatter disc (10).

11. The device as claimed in claim 10, wherein the scatter disc (10) is a surface-structured diffuser.

12. The device as claimed in claim 9, wherein the reflector (5) is injection molded from plastic.

13. A device for producing an image with an image reproduction apparatus (9) which contains light valves, comprising:

a light source comprising a light-emitting diode matrix (1, 2, 3) of light-emitting diodes provided for background lighting of the image reproduction apparatus (9), and an optical device for focussing and scattering light produced by the light-emitting diodes that is arranged between the light source and the image reproduction apparatus;

wherein one matrix point is in each case formed by a number of the light-emitting diodes (1);

the device for focussing and scattering comprises a reflector (5) which is in a form of a grid and forms a light channel for each matrix point, and walls (6) of the light channel are reflective; and

the cross section of each light channel widens in direction of the image reproduction apparatus (9).

14. A device for producing a image with an image reproduction apparatus (9) which contains light valves, comprising:

a light source comprising a light-emitting diode matrix (1, 2, 3) of light-emitting diodes provided for background lighting of the image reproduction apparatus (9), and an optical device for focussing and scattering light produced by the light-emitting diodes that is arranged between the light source and the image reproduction apparatus;

wherein one matrix point is in each case formed by a number of the light-emitting diodes (1);

the device for focussing and scattering comprises a reflector (5) which is in a form of a grid and forms a light channel for each matrix point, and walls (6) of the light channel are reflective; and

a further reflector (8), in a form of a frame, is provided between the reflector (5).

15. A device for producing an image with an image reproduction apparatus (9) which contains light valves, comprising:

a light source comprising a light-emitting diode matrix (1, 2, 3) of light-emitting diodes provided for background lighting of the image reproduction apparatus (9), and an optical device for focussing and scattering light produced by the light-emitting diodes that is arranged between the light source and the image reproduction apparatus;

wherein one matrix point is in each case formed by a number of the light-emitting diodes (1);

the device for focussing and scattering comprises a reflector (5) which is in a form of a grid and forms a light channel for each matrix point, and walls (6) of the light channel are reflective;

wherein the device for focussing and scattering furthermore comprises a scatter disc, which is arranged between the reflector (5), which is in the form of the grid, and the image reproduction apparatus (9), with a distance being provided between the reflector (5) and the scatter disc (10);

the scatter disc (10) is a surface-structured diffuser; and

wherein the surface is structured such that a scatter angle in one direction is greater than in another direction, thus resulting in elliptical scatter.

16. A device for producing an image with an image reproduction apparatus (9) which contains light valves, comprising:

a light source comprising a light-emitting diode matrix (1, 2, 3) of light-emitting diodes provided for background lighting of the image reproduction apparatus (9), and an optical device for focussing and scattering light produced by the light-emitting diodes that as arranged between the light source and the image reproduction apparatus;

wherein one matrix point is in each case formed by a number of the light-emitting diodes (1);

the device for focussing and scattering comprises a reflector (5) which is in a form of a grid and forms a light channel for each matrix point, and walls (6) of the light channel are reflective;

the image reproduction apparatus (9) is further away from the light source (1, 2, 3) on one side of the device than on the other side; and

wherein the image reproduction apparatus has an oblige position such that, disturbing reflection in the direction of the viewer is avoided.

17. A device for producing an image with an image reproduction apparatus (9) which contains light valves, comprising:

a light source comprising a light-emitting diode matrix (1, 2, 3) of light-emitting diodes provided for background lighting of the image reproduction apparatus (9), and an optical device for focussing and scattering light produced by the light-emitting diodes that is arranged between the light source and the image reproduction apparatus; and

further comprising a polarization filter (27) is arranged between the device for focussing and scattering (4, 5, 10) and the light source (1, 2, 3), and said polarization filter passes light in one predetermined polarization direction, and reflects light in other polarization directions.

18. The device as claimed in claim 17, wherein the reproduction apparatus, the light source (1, 2, 3) and the device for focussing and scattering (4, 5, 10) essentially occupy a same area.

19. The device as claimed in claim 17, wherein the image reproduction apparatus (9) is a low-temperature polysilicon TFT display.