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US 9,041,885 B2Granted
Display device and method of LC panel protection
Assignee3M Innovative Properties Company
InventorsMichael F. Weber, Yufeng Liu
Life of this patent
Estimating the term…
Abstract
A display device uses a multilayer film (104), which reflects (red) light having wavelengths between about 600 and 800 nm at a 60 degree angle of incidence (114), to protect a liquid crystal panel (102) from heat and sun damage. The film (104) transmits light of the visible band with a wavelength between about 420 and 650 nm at normal incidence (116). The outermost surface (106) of the film (104) may be a hard coat (124). A metal oxide layer (120) and a metal layer (130) may be included to reflect IR light greater in wavelength than about 850 nm.
Claims16
A display device, comprising:
- A liquid crystal panel, and
- A multilayer optical film, the multilayer optical film located between the liquid crystal panel and an intended viewer, such that light incident upon the device is first incident upon the multilayer optical film,
- Wherein the multilayer optical film comprises UV stable material, such that the multilayer optical film is capable of sustainable outdoor use;
- wherein the film transmits over 60% of a short range visible band of light at a 60 degree angle of incidence through to the liquid crystal panel, and the film reflects an average of at least a majority of a large LC destructive band at a 60 degree angle of incidence;
- wherein the large LC destructive band is light of wavelengths between about 600 and 800 nm, and wherein the multilayer optical film reflects an average of at least about 75% of the LC destructive band at a 60 degree angle of incidence;
- And further wherein the film transmits over 70% of a long range visible band of light at normal incidence through to the liquid crystal panel.
3 more elements
A display device, comprising:
- A liquid crystal panel, and
- A multilayer optical film, the multilayer optical film located between the liquid crystal panel and an intended viewer, such that light incident upon the device is first incident upon the multilayer optical film,
- Wherein the multilayer optical film comprises UV stable material, such that the multilayer optical film is capable of sustainable outdoor use;
- wherein the film transmits over 60% of a short range visible band of light at a 60 degree angle of incidence through to the liquid crystal panel, and the film reflects an average of at least a majority of a large LC destructive band at a 60 degree angle of incidence;
- wherein the LC destructive band is light of wavelengths between about 570 nm and about 900 nm, and wherein the multilayer optical film reflects an average of at least about 75% of the LC destructive band at a 60 degree angle of incidence;
- And further wherein the film transmits over 70% of a long range visible band of light at normal incidence through to the liquid crystal panel.
3 more elements
A method for reducing sun damage to a liquid crystal panel, comprising:
- Directly applying a multilayer optical film to the liquid crystal panel that reflects or absorbs a majority of light having a wavelength of between about 600 nm and about 800 nm at a 60 degree angle of incidence, transmits over 70% of light having a wavelength of between about 420 nm and about 550 nm from a light input surface of the film through to the liquid crystal panel at a 60 degree angle of incidence, and transmits over 70% of light having a wavelength of between about 420 nm and about 650 nm from the input surface through to the liquid crystal panel at normal incidence;
- wherein the multilayer optical film reflects or absorbs at least 75% of light having a wavelength of between about 600 nm and about 800 nm at a 60 degree angle of incidence.
A display device, comprising:
- A liquid crystal panel;
- A multilayer polymeric film optically coupled to the liquid crystal panel;
- and
- A metal layer optically coupled to the multilayer polymeric film and liquid crystal panel;
- and
- At least one metal oxide layer, the metal oxide layer disposed on a surface of the metal layer;
- Wherein a majority of light having a wavelength of between about 420 nm and about 650 nm that is incident on the multilayer polymeric film at a normal angle is transmitted, and a majority of light having a wavelength of between about 420 nm and about 550 nm that is incident on the multilayer polymeric film at a 60 degree incidence angle is transmitted, and a majority of light having a wavelength between about 600 nm and about 800 nm is reflected at a 60 degree incidence angle;
- and
- wherein at least 75% of light having a wavelength of between about 600 and 800 nm that is incident on the multilayer polymeric film at a 60 degree incidence angle is reflected.
6 more elements
Dependencies are inferred from the claim text.