Light extraction film and production method thereof

Abstract

A light-extraction film (2) is a transparent flexible film. A bottom surface of the light-extraction film (2) is of a combined surface of a convex surface (3) and a concave surface (4). The convex surface (3) is a plane and is a binding face with a substrate (1). A natural transition surface of the convex surface (3) and the concave surface (4) is of an inclined surface or an arch-shaped surface and is a reflection surface (5, 6) of light. The width or the diameter a of the convex surface (3) is equal to 0.005 to 0.5 mm. Surface roughness of the convex surface (3) and the transition surface is smaller than R0.05. The height h of the reflection surface (5, 6) is 0.65 to 2.5 times of the width or the diameter a of the convex surface (3). The included angle between a tangent plane of any point on the reflection surface (5, 6) and the top surface of the substrate (1) is 30 to 80 degrees. The production of the light-extraction-film (2) comprises three steps: selection of a light-extraction film (2) material, mold manufacturing, and manufacturing of the light-extraction film (2). Compared with the prior art, the composite light guide plate manufactured by using the light-extraction film (2) has the advantages of one-way extracting light, being high in luminous efficacy, controllable in light brightness and uniformity, and having a self-protection interface structure, and the like.

Description

technical field [0001] The invention relates to an optical material and a production method thereof, in particular to a light extraction film applied to lighting or light-emitting display equipment and capable of extracting light totally reflected between two planes of a transparent substrate out of the plane and a production method thereof. Background technique [0002] CN102565923 discloses a "composite light guide plate", in which a transparent film is attached under the transparent substrate, and light guide points are printed on the lower or upper surface of the transparent film. The defect of the composite light guide plate is that the printed light guide points The reflective ink or astigmatism ink has low luminous efficiency, and light is emitted from both sides, so a reflective plate needs to be added on one side, which affects the luminous efficiency and increases the cost, making it impossible to manufacture large-sized light guide plates. This reference document ...

AI Technical Summary

Problems solved by technology

[0002] CN102565923 discloses a "composite light guide plate", in which a transparent film is attached under the transparent substrate, and light guide points are printed on the lower or upper surface of the transparent film. The defect of the composite light guide plate is that the printed light guide points Reflective inks or astigmatism inks have low light efficiency, and light is emitted from both sides, so a reflector needs to be added on one side, which affects light efficiency and increases costs, making it impossible to manufacture large-sized light guide plates

[0004] One is to emit light from both sides, and a reflector needs to be added to one side, which will affect the light effect and increase the cost

Second, the outgoing light is diffused in a large angle range, and it is difficult to control the angle of the outgoing light

The third is that its light guide points are distributed on the outer surface of the flexible light guide film composite light guide plate, which is easy to accumulate dust and is not easy to remove, which affects the light intensity. The exposed light guide point structure is easy to be damaged and scratched, which affects the use effect and service life

Fourth, diffusion lengthens the transmission distance of light in the panel and increases light loss

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