Illuminated LCD apparatus
AssigneeNokia Mobile Phones Ltd.
InventorsGuy Hooker, Dave Smith
Life of this patent
Estimating the term…
Abstract
A back-lit LCD apparatus comprises a LCD (1), one or more LEDs (3) (or other light sources), and a plate-like light guide (2) behind the LCD (1). An attenuating member (5) is included in front or behind the light guide (5). In the former case the attenuating member (5) is formed as a sheet of reflective material on which is printed a pattern of non-reflective dots for reducing the intensity of light reaching portions of the LCD nearest to the light source. In the latter case the attenuating member (5) is transparent and the dots are either opaque or reflective. The size and frequency of the dots may be varied to adjust the level of attenuation. Also, the pattern of dots may be graduated to provide progressively less attenuation as the distance from the LEDs increases.
Claims8
An illuminated liquid crystal display apparatus, comprising:
- a liquid crystal display,
- a plurality of point light sources generally located behind the liquid crystal display,
- a light guide comprising a transparent plate-like member having side faces disposed behind the liquid crystal display for distributing light from the light sources over an area of the liquid crystal display, and
- light-attenuating means disposed adjacent the light guide and including a pattern of dots defining a distinct individual portion proximate each one of the point light sources and spaced from one another for reducing the intensity of light reaching portions of the liquid crystal display nearest to the individual point light sources.
Dependencies are inferred from the claim text.