Display devices using feedback enhanced light emitting diode

• US 9,985,249 B2
• Filed: 05/22/2017
• Issued: 05/29/2018
• Est. Priority Date: 05/08/2002
• Status: Expired due to Fees

• Current Assignee: Red Bank Technologies LLC
• Original Assignee: Zeolux Corporation
• Inventors: Magno, John N., Koch, Gene C.
• Primary Examiner(s): Williams, Joseph L
• Application Number:
  US15/601,379
• Publication Number:
  US 20170324064A1
• Time in Patent Office: 372 Days
• CPC Class Codes: G09G 3/2803 Display of gradations G09G3/288 takes precedence
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: H01L 33/465 with a resonant cavity structure
• CPC Class Codes: H01S 3/08059 Constructional details of the reflector, e.g. shape mirrors in general G02B5/08; mountings for mirrors G02B7/18
• CPC Class Codes: H01S 3/1065 using liquid crystals
• CPC Class Codes: H01S 3/1686 Liquid crystal active layer
• CPC Class Codes: H01S 5/183 having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
• CPC Class Codes: H01S 5/36 comprising organic materials
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 50/816 Multilayers, e.g. transparent multilayers
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/17 : Passive-matrix OLED displays
• CPC Class Codes: H10K 59/35 : comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/65 : OLEDs integrated with inorganic image sensors
• CPC Class Codes: H10K 71/00 : Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

Display devices using feedback-enhanced light emitting diodes are disclosed. The display devices include but are not limited to active and passive matrix displays and projection displays. A light emissive element disposed between feedback elements is used as light emitting element in the display devices. The light emissive element may include organic or non-organic material. The feedback elements coupled to an emissive element allow the emissive element to emit collimated light by stimulated emission. In one aspect, feedback elements that provide this function include, but are not limited to, holographic reflectors with refractive index variations that are continuous.

Claims

1. A display device, comprising:

a first feedback layer adapted to receive and reflect light;

one or more first electrode strips formed over the first feedback layer;

one or more semiconducting layers formed over the first electrode strips, at least one of the one or more semiconducting layers comprising at least a luminescent material;

one or more second electrode strips formed over the luminescent material the second electrode strips being formed such that they overlay one or more of the first electrode strips, wherein an area where the first electrode strip and the second electrode strip overlap comprises a segment area capable of being driven via the first electrode strips and the second electrode strips;

a second feedback layer adapted to receive and reflect light disposed over the one or more second electrode strips; and

an imaging element disposed proximate to one of the first feedback layer and the second feedback layer;

wherein both the first feedback layer and the second feedback layer have refractive index profiles that vary at least in part periodically along an axis normal or substantially normal to a plane of the respective feedback layer; and

wherein the one or more semiconducting layers comprising at least a luminescent material lie in an optical cavity between the first and second feedback layers.

2. A display device, comprising:

a first feedback layer adapted to receive and reflect light;

one or more transparent or substantially first electrode strips formed over the first feedback layer;

one or more semiconducting layers formed over the first electrode strips, at least one of the one or more semiconducting layers comprising at least a luminescent material;

one or more transparent second electrode strips formed over the luminescent material the second electrode strips being formed such that they overlay one or more of the first electrode strips, wherein an area where the first electrode strip and the second electrode strip overlap comprises a segment area capable of being driven via the first electrode strips and the second electrode strips;

a second feedback layer adapted to receive and reflect light disposed over the one or more second electrode strips; and

an imaging element disposed proximate to one of the first feedback layer and the second feedback layer

wherein the one or more semiconducting layers comprising at least a luminescent material lie in an optical cavity between the first and second feedback layers.

3. A display device, comprising:

a first feedback layer adapted to receive and reflect light;

one or more first electrode strips formed over the first feedback layer,

one or more semiconducting layers formed over the first electrode strips, at least one of the one or more semiconducting layers comprising at least a luminescent material;

one or more second electrode strips formed over the luminescent material the second electrode strips being formed such that they overlay one or more of the first electrode strips, wherein an area where the first electrode strip and the second electrode strip overlap comprises a segment area capable of being driven via the first electrode strips and the second electrode strips; and

a second feedback layer adapted to receive and reflect light disposed over the one or more second electrode strips; and

wherein both the first feedback layer and the second feedback layer have refractive index profiles that vary at least in part periodically along an axis normal or substantially normal to a plane of the respective feedback layer; and

wherein the one or more semiconducting layers comprising at least a luminescent material lie in an optical cavity between the first and second feedback layers.