Display screen with backlight
AssigneeKoninklijke Philips Electronics N.V.
InventorHorst Greiner
Life of this patent
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Abstract
The invention describes a display screen (1) with a backlight, comprising at least a light source (4) and an optical guide plate (2). The homogeneity of the light distribution is achieved by scattering the light rays on reflective indentations (10) in the side faces (9) of the optical guide plate (2) and/or by recesses (11) having vertical walls perpendicular to the front face (7) and/or the back face (8) of the optical guide plate (2). The recesses (11) with vertical walls also improve the coupling-out of the light to the backlight of the display screen (1).
Claims9
A display screen (1) with a backlight, comprising at least a light source (4) and an optical guide plate (2) having a front face (7) facing the display screen (1), a back face (8) and side faces (9),
- characterized in that, for reflection of a light ray (5) emitted by the light source (4) with respect to its vertical component and for diffuse scattering with respect to its other components, the optical guide plate (2) has irregularly arranged recesses (11), said irregularly arranged recesses penetrate the guide plate (2) at least partly and have bottoms 23 and vertical walls, and the guide plate further comprises scattering elements 21 present on the bottoms of the recesses (11) only.
An optical guide plate (2) having a front face (7), a back face (8) and side faces (9), characterized in that the optical guide plate (2) has irregularly arranged recesscs (11) having vertical walls,
- at least one of said irregularly arranged recesses (11) extends partly from said front face to a respective bottom surface, and at least another one of said irregularly arranged recesses (11) extends partly from said back face to a respective bottom surface, and
- the recesses have bottoms (23), and the screen further comprises scattering elements (21) present on the respective bottoms of said at least one and said at least another one of recesses (11) only.
A display screen (1) with a backlight, comprising at least a light source (4) and an optical guide plate (2) having a front face (7) facing the display screen (1), a back face (8) and side faces (9),
- characterized in that, for reflection of a light ray (5) emitted by the light source (4) with respect to its vertical component and for diffuse scattering with respect to its other components, the optical guide plate (2) has irregularly arranged recesses (11) having vertical walls,
- a plurality of said irregularly arranged recesses (11) have respectively different ones of a plurality of cross sectional shapes, and
- said irregularly arranged recesses have bottoms (23), and the screen further comprises scattering elements (21) present on the respective bottoms of the recesses (11) only.
An optical guide plate (2) having a front face (7), a back face (8) and side faces (9), characterized in that the optical guide plate (2) has irregularly arranged recesses (11),
- said recesses penetrate the optical guide plate at least partly and have bottoms (23) and vertical walls, and
- the guide plate further comprises scattering elements 21 present on the bottoms of the recesses (11) only.
Dependencies are inferred from the claim text.