Device for producing an image

• US 20040062040A1
• Filed: 10/15/2002
• Published: 04/01/2004
• Est. Priority Date: 09/27/2002
• Status: Active Grant

• Current Assignee: Star Company Led Technologies LLC (Star Company Scientific Technologies Advanced Research Company LLC)
• Original Assignee: Siemens AG
• Inventors: Mayer, Ralf, Noll, Heinrich, Blume, Heinrich-Jochen, Hohmann, Kai, Brohm, Thomas
• Granted Patent: US 6,964,489 B2
• Time in Patent Office: Days
• US Class Current: 362/231
• 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 means of 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 diodes (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, characterized by the fact that a light source comprising a light-emitting diode matrix (1, 2, 3) is provided for background lighting of the image reproduction apparatus (9), and by the fact that an optical device for focussing and scattering the light produced by the light-emitting diodes is arranged between the light source and the image reproduction apparatus.

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

3. The device as claimed in claim 2, characterized in that the light-emitting diodes (1) of each matrix point emit different colored light.

4. The device as claimed in one of claims 2 or 3, characterized by the fact that four light-emitting diodes (1) form one matrix point.

5. The device as claimed in claim 4, characterized in that two green light-emitting diodes (1), one blue light-emitting diode and one red light-emitting diode (1) are provided for each matrix point.

6. The device as claimed in claim 4, characterized by the fact that two green light-emitting diodes and two red light-emitting diodes are provided for each matrix point.

7. The device as claimed in one of the preceding claims, characterized by the fact that the matrix points are surrounded by in each case one reflector (3, 24).

8. The device as claimed in one of the preceding claims, characterized by the fact that the light valves have associated color filters (14) with different spectral passbands, with the passbands of the colored filters (14) being matched to the spectral light distribution of the light-emitting diodes (1).

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

10. The device as claimed in one of the preceding claims, characterized by the fact that the device for focussing and scattering comprises a reflector (5) which is in the form of a grid and forms a light channel for each matrix point, the walls (6) of which light channel are reflective.

11. The device as claimed in claim 10, characterized by the fact that the cross section of each light channel widens in the direction of the image reproduction apparatus (9).

12. The device as claimed in one of claims 10 or 11, characterized by the fact that a further reflector (8), in the form of a frame, is provided between the reflector (5) [lacuna].

13. The device as claimed in one of claims 10 to 12, characterized by the fact that the device for focussing and scattering furthermore comprises a scatter disc, which is arranged between the reflector (5), which is in the form of a grid, and the image reproduction apparatus (9), with a distance being provided between the reflector (5) which is in the form of a grid, and the scatter disc (10).

14. The device as claimed in claim 13, characterized by the fact that the scatter disc (10) is a surface-structured diffuser.

15. The device as claimed in claim 14, characterized by the fact that the surface is structured such that the scatter angle in one direction is greater than in the other direction, thus resulting in elliptical scatter.

16. The device as claimed in one of claims 10 to 15, characterized by the fact that 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.

17. The device as claimed in one of claims 10 to 16, characterized by the fact that the reflector (5), which is in the form of a grid, is sprayed from plastic.

18. The device as claimed in one of the preceding claims, characterized by the fact that a polarization filter (27) is arranged between the device for focussing and scattering (4, 5, 10) and the light source (1, 2, 3), passes light in one predetermined polarization direction, and reflects light in other polarization directions.

19. The device as claimed in one of the preceding claims, characterized by the fact that the reproduction apparatus, the light source (1, 2, 3) and the device for focussing and scattering (4, 5, 10) essentially occupy the same area.

20. The device as claimed in one of the preceding claims, characterized by the fact that the image reproduction apparatus (9) is a low-temperature polysilicon TFT display.