Light guides suitable for illuminated displays
First Claim
1. A light guide comprising a housing defining a light-guiding optical cavity having first and second opposed major faces, and at least one light source arranged to direct light into the cavity from one end, to be guided between the major faces;
- wherein the first major face comprises a window through which light can be emitted from the optical cavity, and the second major face comprises a sheet material having a specularly-reflecting surface that faces into the cavity and has diffusely-reflecting light-extraction elements applied thereto in a predetermined configuration for causing light to be emitted from the optical cavity through the said window.
1 Assignment
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Accused Products
Abstract
A light guide (1) comprises a housing (3) defining a light-guiding optical cavity having first and second opposed major faces (5, 6), and a light source (11) arranged to direct light into the cavity from one end, to be guided between the major faces. The first major face (5) comprises a window through which light can be emitted from the optical cavity to be used, for example, for illuminating a graphic display. To improve the light distribution across that first major face (5), the second major face (6) comprises a sheet material (23) having a specularly-reflecting surface (24) that faces into the optical cavity and has diffusely-reflecting light-extraction elements (27) applied thereto in a predetermined configuration for causing light to be emitted from the optical cavity through the said window.
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Citations
17 Claims
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1. A light guide comprising a housing defining a light-guiding optical cavity having first and second opposed major faces, and at least one light source arranged to direct light into the cavity from one end, to be guided between the major faces;
- wherein the first major face comprises a window through which light can be emitted from the optical cavity, and the second major face comprises a sheet material having a specularly-reflecting surface that faces into the cavity and has diffusely-reflecting light-extraction elements applied thereto in a predetermined configuration for causing light to be emitted from the optical cavity through the said window.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
Specification