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US 10,890,708 B2Granted
Light guide plate having engraved pattern and backlight unit having same and display device having same
AssigneeKoyj Co., Ltd.
InventorsJai Hyoung Jo, Cha Yeon Kim, Young Gil Kim
Life of this patent
Estimating the term…
Abstract
Disclosed are a light guide plate having an engraved pattern and a backlight unit having the same and a display device having the same, wherein the engraved pattern is configured such that a light incident surface thereof has an arc shape on a plane and a vertical section taken along a straight line passing through a center of the light incident surface is triangular. This makes it possible to maximize total reflection efficiency to increase luminous intensity of light output, resulting in improved light use efficiency and enhanced brightness of the backlight unit.
Claims19
A light guide plate having an engraved pattern, the light guide plate comprising:
- a light guide plate member allowing light of a light source incident upon a first side surface thereof to be output to an upper surface thereof, and having multiple engraved patterns formed in a lower surface thereof and arranged to be spaced apart from each other,
- wherein each of the engraved patterns is configured such that an arc-shaped light incident surface thereof that is oriented toward the light source has a predetermined curvature on a plane and a vertical section thereof taken along a straight line passing through a center of the light incident surface is triangular, and
- wherein the light incident surface has an arc-shaped upper curved line positioned at an upper end thereof and having a predetermined curvature on a plane and an arc-shaped lower curved line positioned at a lower end thereof and having a predetermined curvature on a plane, the curvature of the lower curved line being smaller than that of the upper curved line, and the lower curved line has a radius of curvature of 30 μm to 150 μm.
A backlight unit, comprising:
- a light source emitting light;
- a light guide plate member having a side surface at which the light source is positioned and allowing the light of the light source incident upon the side surface to be output to an upper surface thereof;
- a diffusion sheet positioned on the light guide plate member and diffusing light;
- and
- a prism sheet positioned on the diffusion sheet and configured to refract and condense light,
- wherein the light guide plate member has multiple engraved patterns formed in a lower surface thereof and arranged to be spaced apart from each other, and
- each of the engraved patterns is configured such that an arc-shaped light incident surface thereof that is oriented toward the light source has a predetermined curvature on a plane and a vertical section thereof taken along a straight line passing through a center of the light incident surface is triangular, and
- wherein the light incident surface has an arc-shaped upper curved line positioned at an upper end thereof and having a predetermined curvature on a plane and an arc-shaped lower curved line positioned at a lower end thereof and having a predetermined curvature on a plane, the curvature of the lower curved line being smaller than that of the upper curved line, and the lower curved line has a radius of curvature of 30 μm to 150 μm.
5 more elements
A display device, comprising:
- a light guide plate member having a side surface at which a light source is positioned and allowing light of the light source introduced from the side surface to be output to an upper surface thereof,
- wherein the light guide plate member has multiple engraved patterns formed in a lower surface thereof and arranged to be spaced apart from each other, and
- each of the engraved patterns is configured such that an arc-shaped light incident surface thereof that is oriented toward the light source has a predetermined curvature on a plane and a vertical section thereof taken along a straight line passing through a center of the light incident surface is triangular, and
- wherein the light incident surface has an arc-shaped upper curved line positioned at an upper end thereof and having a predetermined curvature on a plane and an arc-shaped lower curved line positioned at a lower end thereof and having a predetermined curvature on a plane, the curvature of the lower curved line being smaller than that of the upper curved line, and the lower curved line has a radius of curvature of 30 μm to 150 μm.
1 more element
Dependencies are inferred from the claim text.