Light guide plate torsion test method

Abstract

A light guide plate torsion test method includes the following steps: a light guide plate is provided, whether the light guide plate is normal is checked, the light guide plate is cut into a preset area, deformation test of the light guide plate is performed to obtain the light guide plate theory deformation, two fixtures are provided, and are respectively used for applying external forces in opposite directions onto opposing two ends of the light guide plate, the opposing two ends of the light guide plate are respectively clamped in the two fixtures to enable the light guide plate to form a preset torsion contortion and maintain for the first preset time, the light guide plate is removed from the two fixtures, the light guide plate is stood for at least second preset time at room temperature, deformation test of the light guide plate is performed to obtain the light guide plate actual deformation, when the light guide plate is normal, difference between second deformation and first deformation is obtained, and when the difference value is within a predetermined range, torsional stiffness and torsional toughness of the light guide plate can be determined to meet the requirements of long-term use. The test method can effectively screen out light guide plate products which may cause problems after long-term use.

Description

technical field [0001] The invention relates to a test method, in particular to a torsion test method of a light guide plate. Background technique [0002] The light guide plate is widely used in the fields of backlight module technology and light box lighting. The principle is to use optical-grade acrylic / PC sheet, and then use high-tech materials with extremely high reflectivity and non-absorbing light to print light-guiding dots on the bottom of the optical-grade acrylic sheet with UV screen printing technology. The optical grade acrylic sheet is used to absorb the light emitted from the lamp to stay on the surface of the optical grade acrylic sheet. When the light hits each light guide point, the reflected light will spread to all angles, and then destroy the reflection condition by the light guide plate. Front shot. The light guide plate is a high-tech product that transforms the linear light source into a surface light source. Because of the different processes of di...

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Problems solved by technology

[0003] However, the existing detection methods for the quality of the light guide plate still remain at the basic detection level of whether there are black spots, leaks, defects, and whether the surface light source is uniform.

After long-term application of the light guide plate, whether there will be abnormalities such as cracking and deformation of the light guide plate caused by the lack of strength of the light guide plate, which will cause the light guide effect of the light guide plate to change, and the uniformity of the surface light source cannot meet the use requirements, but there is no effective test method. It is impossible to check the quality of the light guide plate after long-term use

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