IMAGE DISPLAY APPARATUS USING PHOSPHOR PARTICLES

• US 20110156574A1
• Filed: 12/16/2010
• Published: 06/30/2011
• Est. Priority Date: 12/25/2009
• Status: Abandoned Application

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Takagi, Akinari, Ikemoto, Kiyokatsu
• Application Number:
  US12/970,115
• Publication Number:
  US 20110156574A1
• Time in Patent Office: Days
• US Class Current: 313/502
• CPC Class Codes: C09K 11/02 Use of particular materials as binders, particle coatings or suspension media therefor
• CPC Class Codes: C09K 11/08 containing inorganic luminescent materials
• CPC Class Codes: H01J 1/64 characterised by the binder or adhesive for securing the luminescent material to its support
• CPC Class Codes: H01J 11/44 Optical arrangements or shielding arrangements, e.g. filters, black matrices, light reflecting means or electromagnetic shielding means
• CPC Class Codes: H01J 2211/442 Light reflecting means; Anti-reflection means
• CPC Class Codes: H01J 2211/444 Means for improving contrast or colour purity, e.g. black matrix or light shielding means
• CPC Class Codes: H01J 2329/892 Anti-reflection, anti-glare, viewing angle and contrast improving means
• CPC Class Codes: H01J 29/22 characterised by the binder or adhesive for securing the luminescent material to its support, e.g. vessel
• CPC Class Codes: H01J 29/896 Anti-reflection means, e.g. eliminating glare due to ambient light

Abstract

The image display apparatus includes a light transmissive substrate, and plural pixels arranged on a further inner side than the substrate. Each pixel includes a light emission layer in which phosphor particles are dispersed in a background medium having a same refractive index as that of the phosphor particle, and an excitation source exciting the phosphor particles to cause them to emit light. Each pixel further includes a refractive index distribution structure disposed between the substrate and the light emission layer and having a periodic refractive index distribution in a direction along an inner surface of the substrate.

Claims

1. An image display apparatus comprising:

a light transmissive substrate; and

plural pixels arranged on a further inner side than the substrate,

wherein each pixel comprising;

a light emission layer in which phosphor particles are dispersed in a background medium having a same refractive index as that of the phosphor particle;

an excitation source exciting the phosphor particles to cause them to emit light; and

a refractive index distribution structure disposed between the substrate and the light emission layer, and having a periodic refractive index distribution in a direction along an inner surface of the substrate.

2. An image display apparatus according to claim 1, wherein the refractive index distribution structure has a two-dimensional lattice structure in the direction along the inner surface of the substrate.

3. An image display apparatus according to claim 1, wherein the plural pixels includes a first pixel, a second pixel and a third pixel for respectively displaying a first color, a second color and a third color, and

wherein one of the first, second and third pixels has a refractive index distribution structure different from that of at least one of the other pixels.

4. An image display apparatus according to claim 1, wherein the plural pixels includes a first pixel, a second pixel and a third pixel for respectively displaying a first color, a second color and a third color, and

wherein the refractive index of the phosphor particle and the background medium in one of the first, second and third pixels is different from that in at least one of the other pixels.