Substrate carriers for electroluminescent displays

• US 5,877,735 A
• Filed: 06/23/1995
• Issued: 03/02/1999
• Est. Priority Date: 06/23/1995
• Status: Expired due to Fees

• Current Assignee: Planar Systems Incorporated (Leyard Optoelectronic Co., Ltd.)
• Original Assignee: Planar Systems Incorporated (Leyard Optoelectronic Co., Ltd.)
• Inventors: Khormaei, Iranpour, Aitchison, Brad, Rhoads, Monte, King, Christopher N.
• Primary Examiner(s): LAO, LUNYI
• Application Number:
  US08/494,184
• Time in Patent Office: 1,348 Days
• Field of Search: 315/169.3, 315/169.1, 313/506, 313/509, 345/36, 345/76-82, 345/204, 345/205, 345/206, 345/211, 345/212, 340/825.81
• US Class Current: 345/76
• CPC Class Codes: G09G 3/30 using electroluminescent panels
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04

Abstract

An active matrix electroluminescent device that includes a plurality of layers. A rearwardly disposed support layer supports the plurality of layers and an interface circuit. The interface circuit is electrically connected to row and column drivers by a plurality of first electrical lines. The drivers are electrically connected to the plurality of layers so as to enable pixels within the electroluminescent device to be selected. An interface controller is remotely located from the support layer and is electrically connected to the interface circuit by at least one second electrical line so as to indicate which pixels within the device to illuminate. The number of first electrical lines is greater than the number of the at least one second electrical line. In another embodiment of the present invention, the number of lines required to interconnect a passive thin film electroluminescent device with an interface controller can in a similar manner be reduced by including an interface circuit.

Claims

1. A thin film electroluminescent device including a plurality of layers including at least a transparent electrode layer, a circuit layer, and at least two layers including an electroluminescent layer and a dielectric layer, said at least two layers disposed between said circuit layer and said transparent electrode layer so as to emit light upon the application of an electric field comprising:

(a) said plurality of layers supported by a rearwardly disposed support layer directly connected to said circuit layer, where said circuit layer is further distant from said emitted light as said emitted light exits said device than said transparent electrode layer;

(b) an interface circuit supported by and directly connected to said support layer;

(c) said support layer rigidly interconnects said circuit layer and said interface circuit such that both said interface circuit and drivers cannot freely move with respect to said circuit layer;

(d) said interface circuit electrically interconnected with said drivers by a plurality of first electrical lines;

(e) said drivers electrically interconnected with said plurality of layers by a plurality of third electrical lines separate from said plurality of said first electrical lines so as to enable pixels within said electroluminescent device to be selected;

(f) an interface controller remotely located from said support layer and electrically interconnected with said interface circuit by at least one second electrical line so as to indicate which pixels within said device to illuminate; and

(g) the number of first electrical lines is greater than the number of said at least one second electrical line.

2. The thin film electroluminescent device of claim 1, wherein the number of first electrical lines is substantially greater than the number of said at least one second electrical line.

3. The thin film electroluminescent device of claim 1 wherein said plurality of layers is supported by a first side of said support layer, said interface circuit is supported by a second side of said support layer, and wire wraps electrically connect said interface circuit to said plurality of layers.

4. The thin film electroluminescent device of claim 1, wherein said plurality of layers is supported by a first side of said support layer, said interface circuit is supported by a second side of said support layer, and a plurality of vias in said support layer electrically connect said interface circuit to said plurality of layers.

5. The thin film electroluminescent device of claim 1, wherein said interface circuit includes an electroluminescent driver, said electroluminescent driver generates a high voltage signal in response to receiving a low voltage signal, and said high voltage signal energizes said transparent electrode layer.

6. The thin film electroluminescent device of claim 1, wherein said drivers are row drivers and column drivers to energize selected pixel electrodes within said plurality of layers.

7. The thin film electroluminescent of claim 1 wherein both said plurality of layers and said interface circuit are supported on the same side of said support layer.

8. The thin film electroluminescent device of claim 1, wherein said support layer has high thermal conductivity.

9. The thin film electroluminescent device of claim 1, wherein said support layer is a dielectric.

10. A thin film electroluminescent device includes a plurality of layers including at least a front electrode layer, a rear electrode layer, and at least two layers including an electroluminescent layer and a dielectric layer, said at least two layers disposed between said rear electrode layer and said front electrode layer so as to emit light upon the application of an electric field comprising:

(a) said plurality of layers supported by a rearwardly disposed support layer directly connected to said rear electrode layer, where said rear electrode layer is further distant from said emitted light as said emitted light exits said device than said front electrode layer;

(b) an interface circuit supported by and directly connected to said support layer;

(c) said support layer rigidly interconnects said rear electrode layer and said interface circuit such that both said interface circuit and drivers cannot freely move with respect to said rear electrode layer;

(d) a plurality of first electrical lines electrically interconnecting said interface circuit to said drivers, said drivers electrically interconnected with said plurality of layers by a plurality of third electrical lines separate from said plurality of said first electrical lines so as to enable said front electrodes and selected said rear electrodes to be energized;

(e) an interface controller remotely located from said support layer and electrically interconnected with said interface circuit by at least one second electrical line so as to indicate which pixels within said device to illuminate; and

(f) the number of first electrical lines is greater than the number of said at least one second electrical line.

11. The thin film electroluminescent device of claim 10, wherein the number of first electrical lines is substantially greater than the number of said at least one second electrical line.

12. The thin film electroluminescent device of claim 10, wherein said plurality of layers is supported by a first side of said support layer, said interface circuit is supported by a second side of said support layer, and wire wraps electrically connect said interface circuit to said plurality of layers.

13. The thin film electroluminescent device of claim 10, wherein said plurality of layers is supported by a first side of said support layer, said interface circuit is supported by a second side of said support layer, and a plurality of vias in said support layer electrically connect said interface circuit to said plurality of layers.

14. The thin film electroluminescent device of claim 10, wherein said interface circuit includes an electroluminescent driver, said electroluminescent driver generates a high voltage signal in response to receiving a low voltage signal, and said high voltage signal energizes said selected rear electrodes.

15. The thin film electroluminescent device of claim 10, wherein said interface circuit includes row drivers and column drivers to energize respective row electrodes and column electrodes within said plurality of layers.

16. The thin film electroluminescent of claim 10 wherein both said plurality of layers and said interface circuit are supported on the same side of said support layer.

17. The thin film electroluminescent device of claim 10, wherein said support layer is a dielectric.

18. The thin film electroluminescent device of claim 10, wherein said support layer has high thermal conductivity.