Color neutral emissive display with notched reflective polarizer
Assignee3M Innovative Properties Company
InventorsAdam D. Haag, Timothy J. Nevitt, Martin E. Denker
Life of this patent
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Abstract
A display system is disclosed and includes a display and a reflective polarizer disposed on the display. For substantially normally incident light, for a primary wavelength λb, the reflective polarizer transmits at least 60% of the incident light having a first polarization state x and reflects at least 60% of the incident light having an orthogonal second polarization state y. For each of a first wavelength λuv and a second wavelength λbg, 0<λb-λuv≤100 nm#and 0<λbg-λb≤100 nm, the reflective polarizer transmits at least 40% of the incident light for each of the first and second polarization states.
Claims13
A display system, comprising:
- a display including a plurality of pixels and configured to emit an image for viewing by a viewer;
- a reflective polarizer disposed on the display, for an incident light at an incident angle of about 0 degrees:
- for a primary wavelength λb, the reflective polarizer transmitting at least 60% of the incident light having a first polarization state and reflecting at least 60% of the incident light having an orthogonal second polarization state;
- and
- for each of a first wavelength λuv and a second wavelength λbg, 0<λb-λuv≤100 nm and 0<λbg-λb≤100 nm, the reflective polarizer transmitting at least 40% of the incident light for each of the first and second polarization states;
- and
- a retarder layer disposed between the reflective polarizer and the display, such that when a D65 incident light from a D65 illuminant is incident on the display system at an incident angle θ1, the display system reflects at least a portion of the D65 incident light, after the D65 incident light is reflected at least twice by the display, as an exiting light propagating at an exit angle θ2 about equal to the incident angle θ1, a maximum difference between corresponding CIE 1931 color chromaticity coordinates x and y of the D65 incident light and the exiting light being less than about 0.06 for at least one incident angle less than about 20 degrees.
A display system, comprising:
- a display configured to emit an image in a visible wavelength range, the display including a blue pixel configured to emit blue light, the emitted blue light having a blue peak at a blue wavelength λb in the visible wavelength range;
- a linear absorbing polarizer layer disposed on the display;
- a reflective polarizer disposed between the linear absorbing polarizer layer and the display;
- and
- a retarder layer disposed between the reflective polarizer and the display and having a deviation Δ from being a quarter-wave retarder, wherein for a wavelength in a blue wavelength range, the retarder layer has a retardance of about a quarter of the wavelength;
- such that for an incident light at an incident angle of about 0 degrees:
- for the blue wavelength λb, the reflective polarizer transmits at least 60% of light having a first polarization state and reflects at least 60% of light having an orthogonal second polarization state;
- for at least one wavelength λuv less than λb, λb-λuv≤50 nm, and for each wavelength λ in the visible wavelength range, λ-λb≥50 nm, the reflective polarizer transmits at least 40% of the incident light for each of the first and second polarization states;
- Δ is Δb at the wavelength λb, and Δr at at least one red wavelength λr in the visible wavelength range, λr-λb≥100 nm, Δb≤Δr;
- and
- for the first polarization state, the linear absorbing polarizer has a greater transmittance at the red wavelength λr than the blue wavelength λb.
Dependencies are inferred from the claim text.