Display device, plasma display device, and optical filter
View Patent ↗The present invention provides an optical filter for a display device capable to improve the bright-location contrast, and a display device in particular a plasma display device incorporating the optical filter. In a transmittance spectrum of the optical filter, a transmittance in a region having a wavelength range of 430 nm to 445 nm, a transmittance in a region having a wavelength range of 535 to 560 nm, and a transmittance in a region having a wavelength range of 605 to 630 nm are set to 80% or less of the maximum transmittance over the entire visible wavelength region.
1. A display device having a display panel and a single optical filter positioned on a display surface side of the display panel, wherein optical transmittances of the single optical filter are 80% or less of the maximum transmittance over the entire visible wavelength region in at least two wavelength regions among a first wavelength region having a wavelength range of 430 to 445 nm, a second wavelength region having a wavelength range of 535 to 560 nm, and a third wavelength region having a wavelength range of 605 to 630 nm.
2. The display device according to claim 1 , wherein the maximum transmittance exists in a wavelength region other than the first through third wavelength regions.
3. The display device according to claim 2 , wherein the optical transmittances are 80% or less of the maximum transmittance in all the first though third wavelength regions.
4. The display device according to claim 1 , wherein the transmittances of the optical filter in the second and third wavelength regions are 80% or less of the maximum transmittance and the transmittance in the first wavelength region is above 80% of the maximum transmittance, and in the display panel, the emission intensity in the first wavelength region is lower than the emission intensities in the second and third wavelength regions.
5. The display device according to claim 1 , wherein the transmittances of the optical filter in the first and third wavelength regions are 80% or less of the maximum transmittance and the transmittance in the second wavelength region is above 80% of the maximum transmittance, and in the display panel, the emission intensity in the second wavelength region is lower than the emission intensities in the first and third wavelength regions.
6. The display device according to claim 1 , wherein the transmittances of the optical filter in the first and second wavelength regions are 80% or less of the maximum transmittance and the transmittance in the third wavelength region is above 80% of the maximum transmittance, and in the display panel, the emission intensity in the third wavelength region is lower than the emission intensities in the first and second wavelength regions.
7. The display device according to claim 1 , wherein the optical filter absorbs at least a part of neon light emissions, at least a part of near-ultraviolet rays, and at least a part of near-infrared rays.
8. The display device according to claim 1 , wherein the display panel is a plasma display panel.
9. A plasma display device having a plasma display panel and a single optical filter positioned on a display surface side of the plasma display panel, wherein optical transmittances of the single optical filter are 80% or less of the maximum transmittance over the entire visible wavelength region in at least two wavelength regions among a first wavelength region having a wavelength range of 430 to 445 nm, a second wavelength region having a wavelength range of 535 to 560 nm, and a third wavelength region having a wavelength range of 605 to 630 mm.
10. The plasma display device according to claim 9 , wherein the maximum transmittance exists in a wavelength region other than the first through third wavelength regions.
11. The plasma display device according to claim 10 , wherein the optical transmittances are 80% or less of the maximum transmittance in all the first though third wavelength regions.
12. The plasma display device according to claim 9 , wherein the transmittances of the optical filter in the second and third wavelength regions are 80% or less of the maximum transmittance and the transmittance in the first wavelength region is above 80% of the maximum transmittance, and in the display panel, the emission intensity in the first wavelength region is lower than the emission intensities in the second and third wavelength regions.
13. The plasma display device according to claim 9 , wherein the transmittances of the optical filter in the first and third wavelength regions are 80% or less of the maximum transmittance and the transmittance in the second wavelength region is above 80% of the maximum transmittance, and in the display panel, the emission intensity in the second wavelength region is lower than the emission intensities in the first and third wavelength regions.
14. The plasma display device according to claim 9 , wherein the transmittances of the optical filter in the first and second wavelength regions are 80% or less of the maximum transmittance and the transmittance in the third wavelength region is above 80% of the maximum transmittance, and in the display panel, the emission intensity in the third wavelength region is lower than the emission intensities in the first and second wavelength regions.
15. The plasma display device according to claim 9 , wherein the optical filter absorbs at least a part of neon light emissions, at least a part of near-ultraviolet rays, and at least a part of near-infrared rays.
16. A single optical filter applied on a display surface side of a display device, wherein optical transmittances of said single optical filter are 80% or less of the maximum transmittance over the entire visible wavelength region in at least two wavelength regions among a first wavelength region having a wavelength range of 430 to 445 nm, a second wavelength region having a wavelength range of 535 to 560 nm, and a third wavelength region having a wavelength range of 605 to 630 nm.
17. The optical filter according to claim 16 , wherein the maximum transmittance exists in a wavelength region other than the first through third wavelength regions.
18. The optical filter according to claim 17 , wherein the optical transmittances are 80% or less of the maximum transmittance in all the first though third wavelength regions.
19. The optical filter according to claim 16 , wherein at least a part of neon light emissions, at least a part of near-ultraviolet rays, and at least a part of near-infrared rays are absorbed.
20. The optical filter according to claim 16 , wherein the optical filter is incorporated into a plasma display device.