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US 6,266,114 B1Granted
Method and apparatus for compensating a liquid crystal display
AssigneeRockwell Collins, Inc.
InventorMark C. Skarohlid
Life of this patent
Estimating the term…
Abstract
An optical system including an LCD rubbed for a 6 o'clock director orientation, one or more positively uniaxial retarders (A-plates) adjacent to the LCD, and a pair of positive retardance oblique waveplates (O-plates) on TAC substrates adjacent to one another and the input polarizer, all encompassed by a polarizer on each side of the optical stack, aligned for a normally white display.
Claims20
A display apparatus comprising:
- a first polarizer having a first polarizer absorption axis from 30° to 60° from a predetermined reference;
- a first O-plate, optically in series with said first polarizer, said first O-plate having a first O-plate retardation range from +70 nm to +140 nm, and having a first O-plate optical axis oriented between 30° and 60° from said predetermined reference, said first O-plate having said optical axis inclined with a low tilt at an angle of 2° to 10° and a high tilt angle of 30° to 60°;
- a second O-plate, optically in series with said first O-plate, and having a second O-plate retardation range from +70 nm to +140 nm and a second O-plate optical axis oriented between 120° and 150° from said predetermined reference, said second O-plate optical axis inclined with a low tilt at an angle of 2° to 10° and a high tilt angle of 30° to 60°;
- a first A-plate, optically in series with said second O-plate, said first A-plate having a first A-plate retardation range from +30 nm to +180 nm, a first A-plate optical axis oriented between 30° and 60° from said predetermined reference, and having said optical axis inclined from 0° to 10°;
- a liquid crystal material, optically in series with said first A-plate, said liquid crystal material having a liquid crystal retardation range from +300 nm to +500 nm, a front surface rub angle in a range from 30° to 60°, a back surface rub angle in a range from 285° to 345°;
- and
- a second polarizer, optically in series with said second liquid crystal material, said second polarizer having an absorption axis of 120° to 150°.
4 more elements
A display comprising:
- means for polarizing light from a light source;
- means for compensating light in a range from +70 nm to +140 nm with an optical axis orientation of 30° to 60° from a predetermined reference;
- means for compensating light in a range from +70 nm to +140 nm with an optical axis orientation of 120° to 150° and with an optical axis inclination that varies between a low tilt angle of between 2° to 10°, to a high tilt angle of between 30° and 60°;
- means for compensating light in a range from +30 nm to +180 nm with an optical axis orientation of 30° to 60°;
- means for selectively twisting light in response to an input signal;
- means for compensating light in a range from +30 nm to +180 nm with an optical axis orientation of 30° to 60°;
- and,
- means for polarizing light that has been compensated.
5 more elements
A display comprising:
- a first O-plate optical compensation element;
- a second O-plate optical compensation element, disposed adjacent to said first O-plate optical compensation element;
- a first A-plate, disposed adjacent to said second O-plate optical compensation element;
- and,
- a liquid crystal media, disposed adjacent to said first A-plate,
- wherein said first O-plate optical compensation element has a first O-plate optical compensation element optical axis oriented at an angle between 30° and 60° from a predetermined reference and further wherein said second O-plate optical compensation element has a second O-plate optical compensation element optical axis oriented between 120° and 150° from said predetermined reference, and said display further includes a second A-plate, disposed adjacent to said liquid crystal media.
3 more elements
A method of compensating a liquid crystal display comprising the steps of:
- retarding light from a predetermined source of light in a range of +70 nm to +140 nm with a first compensator with an optical axis oriented between 30° and 60° from a predetermined reference;
- further retarding said light with a second compensator with an optical axis oriented between 120° and 150°;
- further retarding said light, in a range from +30 nm to +180 nm with a third compensator with an optical axis oriented between 30° and 60°;
- selectively twisting said light in response to an input control signal;
- and,
- further retarding said light, in a range from +30 nm to +180 nm with a fourth compensator having an optical axis oriented between 30° and 60°.
3 more elements
Dependencies are inferred from the claim text.