Selfluminous display device having light emission sources having substantially non-overlapping spectra levels

• US 6,222,203 B1
• Filed: 06/18/1997
• Issued: 04/24/2001
• Est. Priority Date: 06/18/1996
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nakayama, Norikazu, Ishibashi, Akira
• Primary Examiner(s): Tran, Minh Loan
• Application Number:
  US08/878,418
• Time in Patent Office: 1,406 Days
• Field of Search: 257/88, 257/89, 257/90, 257/103, 257/79, 372/43, 372/45
• US Class Current: 257/88
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: H01L 27/156 two-dimensional arrays
• CPC Class Codes: H01S 5/327 in AIIBVI compounds, e.g. ZnCdSe-laser
• CPC Class Codes: H01S 5/34333 with a well layer based on Ga(In)N or Ga(In)P, e.g. blue laser
• CPC Class Codes: H01S 5/4087 emitting more than one wavelength
• CPC Class Codes: H01S 5/423 having a vertical cavity

Abstract

A selfluminous display device having distinct blue (B), green (G) and red (R) light emission sources wherein the spectra of the light emission sources each have a narrow half band width (30 nm or less) at a level regarded as precursor delta functions, which do not mutually substantially overlap. Because light sources having spectra of limited peak values and extremely narrow limited widths are used, shape changes of the spectrum in each light source are suppressed in the wavelength space and can be regarded as purely magnitude changes. Therefore, it becomes possible to correct just by changing the strength for each light emission source, color reproducibility increases and there ceases to be any change over time in the colors.

Claims

1. A selfluminous display device comprising:

a plurality of red, green, and blue light emission sources, each of said red, green, and blue sources having spectra levels that substantially do not mutually overlap and respectively having a spectra half band width which is 30 nm or less.

2. The selfluminous display device according to claim 1, wherein said light emission sources comprising red, green and blue light emission sources respectively have precursor delta function shaped spectra of half band width 30 nm or less.

3. The selfluminous display device according to claim 1, wherein at least one of said light emission sources comprises a light emitting diode.

4. The selfluminous display device according to claim 3, wherein said light emitting diode is a surface emission type LED.

5. The selfluminous display device according to claim 3, wherein said light emitting diode is comprised of at least a clad layer and an active layer of a first conductive type and a clad layer of a second conductive type comprised of a group II-VI compound semiconductor.

6. The selfluminous display device according to claim 3, wherein said light emitting diode is comprised of at least a clad layer and an active layer of a first conductive type and a clad layer of a second conductive type comprised of a group II-V compound semiconductor.

7. The selfluminous display device according to claim 1, wherein at least one of said light emission sources is a semiconductor laser.

8. The selfluminous display device according to claim 7, wherein said semiconductor laser is a surface emission type semiconductor laser.

9. The selfluminous display device according to claim 7, wherein said semiconductor laser comprises at least a clad layer and an active layer of a first conductive type and a clad layer of a second conductive type comprised of a group II-VI compound semiconductor.

10. The selfluminous display device according to claim 7, wherein said semiconductor laser is comprised of at least a clad layer and an active layer of a first conductive type and a clad layer of a second conductive type comprised of a group III-V compound semiconductor.

11. The selfluminous display device according to claim 1, wherein said emission sources are comprised of semiconductor lasers including lasers having red, green or blue light emissions each having a spectra wherein the half band width of the envelope function is 30 nm or less.

12. The selfluminous display device according to claim 11, wherein said semiconductor lasers are surface emission type lasers.

13. The selfluminous display device according to claim 11, wherein said semiconductor lasers are comprised of at least a clad layer and an active layer of a first conductivity type and a clad layer of a second conductivity type comprised of a group II-VI compound semiconductor.

14. The selfluminous display device according to claim 11, wherein said semiconductor laser are comprised of at least a clad layer and an active layer of a first conductivity type and a clad layer of a second conductivity type comprised of a group III-V compound semiconductor.