Direct-LIT liquid crystal displays with laminated diffuser plates
First Claim
1. A directly illuminated liquid crystal display (LCD) unit, comprising:
- a light source;
an LCD panel comprising an upper plate, a lower plate and a liquid crystal layer disposed between the upper and lower plates, the lower plate facing the light source, the lower plate comprising an absorbing polarizer; and
an arrangement of light management films disposed between the light source and the LCD panel so that the light source illuminates the LCD panel through the arrangement of light management films, the arrangement of light management films comprising at least a first diffuser layer, at least the first diffuser layer being attached to a lower surface of the lower plate of the LCD panel,wherein a value of σ
/x is less than 1.5%, where x is the level of illumination light passing from the arrangement of light management films to the LCD panel, averaged across the LCD panel, and σ
is the root mean square deviation in the level of illumination light across the arrangement of light management films.
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Accused Products
Abstract
In a directly-illuminated liquid crystal display (LCD), for example an LCD monitor or an LCD-TV, a number of light management films, including a diffuser layer, lie between the light source and the LCD panel to provide bright, uniform illumination. The diffuser layer is attached to a substrate which is separate from the light source and the LCD panel, or may be attached to either the LCD panel or, when using a two dimensional light source, to the light source. The other light management layers may also be attached to the separate substrate or to the LCD panel or two-dimensional light source. High levels of illumination uniformity at the LCD may be achieved with a uniform (non-patterned) diffuser, even with relatively low levels of diffusion, when the diffuser is used with a brightness enhancing layer.
93 Citations
8 Claims
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1. A directly illuminated liquid crystal display (LCD) unit, comprising:
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a light source; an LCD panel comprising an upper plate, a lower plate and a liquid crystal layer disposed between the upper and lower plates, the lower plate facing the light source, the lower plate comprising an absorbing polarizer; and an arrangement of light management films disposed between the light source and the LCD panel so that the light source illuminates the LCD panel through the arrangement of light management films, the arrangement of light management films comprising at least a first diffuser layer, at least the first diffuser layer being attached to a lower surface of the lower plate of the LCD panel, wherein a value of σ
/x is less than 1.5%, where x is the level of illumination light passing from the arrangement of light management films to the LCD panel, averaged across the LCD panel, and σ
is the root mean square deviation in the level of illumination light across the arrangement of light management films. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification