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US 5,831,698 AGranted
Electrically variable diffuser
AssigneeInternational Business Machines Corporation
InventorsSteven W. Depp, Anthony Cyril Lowe, Robert Luke Wisnieff
Life of this patent
Estimating the term…
Abstract
A display having an electrically variable diffuser is disclosed. In response to an electric field, the electrically variable diffuser is electrically switched from a low illumination/narrow viewing angle mode to a high illumination/wide viewing angle mode. The viewing angle is correlated with backlight luminance to provide an adequate display as the viewing angle is varied. This allows a user to choose between preserving battery life and maximizing viewing angle.
Claims16
A display comprising:
- an illumination means to provide a substantially uniform illumination;
- a cell which receives said illumination;
- and
- a switchable diffuser located between said illumination means and said cell, said switchable diffuser varying a viewing angle of said display, wherein said switchable diffuser and said illumination means are responsive to a signal that varies said display between a low illumination/narrow viewing angle mode and a high illumination/wide viewing angle mode.
1 more element
A display comprising:
- an illumination means to provide illumination at a predetermined viewing angle, said illumination means being located at a rear of said display;
- a cell which receives said illumination;
- and
- a switchable diffuser located at a front of said display, wherein in response to a signal said switchable diffuser changes from a substantially transparent state to a scattering state, said signal switching said display between a low illumination/narrow viewing angle mode, corresponding to said substantially transparent state, and a high illumination/wide viewing angle mode, corresponding to said scattering state.
1 more element
A display comprising:
- an illumination means to provide a substantially uniform illumination;
- a cell which receives said illumination;
- and
- a variable diffuser located between said illumination means and said cell, wherein in response to a signal said variable diffuser changes from a substantially transparent state to a scattering state, said signal varying said display between a low illumination/narrow viewing angle mode, corresponding to said substantially transparent state, and a high illumination/wide viewing angle mode, corresponding to said scattering state.
1 more element
Dependencies are inferred from the claim text.