LIGHT OUTPUT DEVICE

• US 20100188005A1
• Filed: 07/25/2008
• Published: 07/29/2010
• Est. Priority Date: 08/02/2007
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Van Herpen, Maarten Marinus Johannes Wilhelmus, Bremer, Petrus Johannes, Liedenbaum, Coen Theodorus Hubertus Fransiscus
• Granted Patent: US 8,242,717 B2
• Time in Patent Office: Days
• US Class Current: 315/210
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10706 being photo-polymerized
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/08 Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: H05B 45/44 with an active control inside an LED matrix

Abstract

A light output device comprises a substrate arrangement comprising a plurality of light source circuits integrated into the structure of the substrate arrangement. Each light source circuit comprises a light source device arrangement (4) having two terminals and a transistor circuit (7). Each light source circuit is supplied with power from an associated pair the power connections (10,11,14,15,20), and at least two light source circuits (4,7) share the same pair of power connections. A set of control connections (18) are provided for receiving external control signals for controlling the transistor circuits (7). A set of non-overlapping electrodes (10,11,14,15,18,20) provide the internal connections between the power connections, the light source device terminals and the transistor circuits, and each light source device is individually independently controllable.

Claims

1. A light output device comprising:

a substrate arrangement;

a plurality of light source circuits integrated into the substrate arrangement, each light source circuit comprising a light source device arrangement having two terminals and a transistor circuit;

a set of power connections for receiving external power, wherein each light source circuit is associated with a pair of the power connections for the supply of power to the light source circuit, and wherein at least two light source circuits share the same pair of power connections;

a set of control connections for receiving control signals for controlling the respective transistor circuits; and

a set of non-overlapping electrodes for providing internal connections between the power connections, the light source device terminals and the transistor circuits,

wherein each light source device arrangement is individually and independently controllable.

2. A device as claimed in claim 1, each light source device arrangement comprises a single light source device.

3. A device as claimed in claim 1, wherein each transistor circuit comprises a single transistor.

4. A device as claimed in claim 3, wherein each transistor comprises a MOSFET.

5. A device as claimed in claim 1, wherein each transistor has its gate connected to a respective control connection.

7. A device as claimed in claim 5, wherein the at least two light source circuits which share the same pair of power connections are connected in series between the power connections, with each transistor connected in parallel across the light source device arrangement.

8. A device as claimed in claim 7, further comprising a power source arrangement, comprising a current source for each set of light source circuits which share the same pair of power connections.

9. A device as claimed in claim 7, further comprising a control circuit for controlling the transistor circuits, wherein the control levels applied to the transistors are selected in dependence on which light source circuits are turned on and which are turned off.

10. A device as claimed in claim 1, comprising a control circuit for dimming the light intensity of a light source device using duty cycle control.

11. A device as claimed in claim 1, wherein one of the power connections is shared between all light source circuits.

12. A device as claimed in claim 1, wherein the electrodes comprise at least semi-transparent conductors.

13. A device as claimed in claim 1, wherein the light source device comprises an LED device or a group of LED devices.

14. A device as claimed in claim 13, wherein the light source device comprises an inorganic LED, an organic LED, a polymer LED or a laser diode.

16. A lighting system comprising a light output device as claimed in claim 1 and a lighting controller, wherein the substrate arrangement comprises first and second transparent substrates and an electrode arrangement embedded in the substrate arrangement, with the plurality of light source circuits connected to the electrode arrangement.

17. A lighting system as claimed in claim 16, wherein a thermoplastic or resin layer is provided between the substrates.

18. A lighting system as claimed in claim 16, wherein the electrode arrangement is formed of a transparent conductive material.

19. A lighting system as claimed in claim 18, wherein the electrode arrangement is formed of a transparent metal oxide.

20. A lighting system as claimed in claim 16, wherein the transistors of the transistor circuits comprise a transparent transistor in a transparent package.

6. (canceled)

15. (canceled)