Inspection method, inspection device, manufacturing method, and manufacturing device for optical wavelength conversion sheet, optical wavelength conversion sheet, backlight device, liquid crystal panel, and liquid crystal display device
AssigneeFUJIFILM Corporation
InventorsTakashi Suganuma, Masakazu Takematsu
Life of this patent
Estimating the term…
Abstract
An inspection is performed using a captured image obtained by irradiating, with blue light, an optical wavelength conversion sheet that includes a quantum dot layer which contains a quantum dot emitting red light and green light by receiving blue light with blue light from a back surface side and imaging from a front surface side with a camera. A filter which cuts the blue light and transmits the red light and the green light is disposed between the camera and the optical wavelength conversion sheet.
Claims19
An inspection method for an optical wavelength conversion sheet having an optical wavelength conversion layer that contains an optical wavelength converter which emits, by receiving light in a first wavelength range, light in a second wavelength range having a peak wavelength different from a peak wavelength of the light in the first wavelength range, the inspection method comprising:
- an irradiating step of irradiating a back surface of the optical wavelength conversion sheet with illumination light including the light in the first wavelength range;
- an imaging step of imaging an optical wavelength conversion sheet from a front surface side of the optical wavelength conversion sheet;
- an imaging wavelength selection step of separating, between the irradiating step and the imaging step, light from the optical wavelength conversion sheet into the light in the first wavelength range and light in a wavelength range other than the first wavelength range, and selecting the light in a wavelength range other than the first wavelength range as light for imaging and emitting the light toward the imaging step;
- a primary inspection step including the irradiating step, the imaging step, and the imaging wavelength selection step;
- and
- a secondary inspection step including a secondary irradiating step of irradiating the back surface of the optical wavelength conversion sheet with illumination light including the light in the first wavelength range and the light in the second wavelength range, and a secondary imaging step of imaging a light from the optical wavelength conversion sheet from the front surface side of the optical wavelength conversion sheet.
An inspection device for an optical wavelength conversion sheet having an optical wavelength conversion layer that contains an optical wavelength converter which emits, by receiving light in a first wavelength range, light in a second wavelength range having a peak wavelength different from a peak wavelength of the light in the first wavelength range, the inspection device comprising:
- an irradiation mechanism of irradiating a back surface of the optical wavelength conversion sheet with illumination light including the light in the first wavelength range;
- an imaging mechanism of imaging an optical wavelength conversion sheet from a front surface side of the optical wavelength conversion sheet;
- an imaging wavelength selection mechanism of separating, in the optical wavelength conversion sheet and the imaging mechanism, the light in the first wavelength range and light in a wavelength range other than the first wavelength range, and selecting the light in a wavelength range other than the first wavelength range as light for imaging and emitting the light toward the imaging mechanism;
- a primary inspection mechanism including the irradiating mechanism, the imaging mechanism, and the imaging wavelength selection mechanism;
- and
- a secondary inspection mechanism including a secondary irradiating mechanism of irradiating the back surface of the optical wavelength conversion sheet with illumination light including the light in the first wavelength range and the light in the second wavelength range, and a secondary imaging mechanism of imaging a light from the optical wavelength conversion sheet from the front surface side of the optical wavelength conversion sheet.
A manufacturing method for an optical wavelength conversion sheet having an optical wavelength conversion layer that contains an optical wavelength converter which emits, by receiving light in a first wavelength range, light in a second wavelength range having a peak wavelength different from a peak wavelength of the light in the first wavelength range, the manufacturing method comprising:
- a forming step of forming the optical wavelength conversion layer;
- and
- an inspection step of inspecting an optical wavelength conversion sheet on which the optical wavelength conversion layer is formed,
- wherein the inspection step includes:
- an irradiating step of irradiating a back surface of the optical wavelength conversion sheet with illumination light including the light in the first wavelength range;
- an imaging step of imaging an optical wavelength conversion sheet from a front surface side of the optical wavelength conversion sheet;
- an imaging wavelength selection step of separating, between the irradiating step and the imaging step, light from the optical wavelength conversion sheet into the light in the first wavelength range and light in a wavelength range other than the first wavelength range, and selecting the light in a wavelength range other than the first wavelength range as light for imaging and emitting the light toward the imaging step;
- a primary inspection step including the irradiating step, the imaging step, and the imaging wavelength selection step;
- and
- a secondary inspection step including a secondary irradiating step of irradiating the back surface of the optical wavelength conversion sheet with illumination light including the light in the first wavelength range and the light in the second wavelength range, and a secondary imaging step of imaging a light from the optical wavelength conversion sheet from the front surface side of the optical wavelength conversion sheet.
A manufacturing device for an optical wavelength conversion sheet having an optical wavelength conversion layer that contains an optical wavelength converter which emits, by receiving light in a first wavelength range, light in a second wavelength range having a peak wavelength different from a peak wavelength of the light in the first wavelength range, the manufacturing device comprising:
- a forming device for forming the optical wavelength conversion layer;
- and
- an inspection device for inspecting an optical wavelength conversion sheet on which the optical wavelength conversion layer is formed,
- wherein the inspection device includes:
- an irradiation mechanism of irradiating a back surface of the optical wavelength conversion sheet with illumination light including the light in the first wavelength range;
- an imaging mechanism of imaging an optical wavelength conversion sheet from a front surface side of the optical wavelength conversion sheet;
- an imaging wavelength selection mechanism of separating, in the optical wavelength conversion sheet and the imaging mechanism, the light in the first wavelength range and light in a wavelength range other than the first wavelength range, and selecting the light in a wavelength range other than the first wavelength range as light for imaging and emitting the light toward the imaging mechanism;
- a primary inspection mechanism including the irradiating mechanism, the imaging mechanism, and the imaging wavelength selection mechanism;
- and
- a secondary inspection mechanism including a secondary irradiating mechanism of irradiating the back surface of the optical wavelength conversion sheet with illumination light including the light in the first wavelength range and the light in the second wavelength range, and a secondary imaging mechanism of imaging a light from the optical wavelength conversion sheet from the front surface side of the optical wavelength conversion sheet.
A manufacturing method for an optical wavelength conversion sheet having an optical wavelength conversion layer that contains an optical wavelength converter which emits, by receiving light in a first wavelength range, light in a second wavelength range having a peak wavelength different from a peak wavelength of the light in the first wavelength range, the manufacturing method comprising:
- a forming step of forming the optical wavelength conversion layer;
- an inspection step of inspecting an optical wavelength conversion sheet on which the optical wavelength conversion layer is formed;
- and
- a removal step of removing a defective portion detected in the inspection step from a portion used as a product,
- wherein the inspection step includes:
- an irradiating step of irradiating a back surface of the optical wavelength conversion sheet with illumination light including the light in the first wavelength range;
- an imaging step of imaging an optical wavelength conversion sheet from a front surface side of the optical wavelength conversion sheet;
- an imaging wavelength selection step of separating, between the irradiating step and the imaging step, light from the optical wavelength conversion sheet into the light in the first wavelength range and light in a wavelength range other than the first wavelength range, and selecting the light in a wavelength range other than the first wavelength range as light for imaging and emitting the light toward the imaging step;
- a defective portion candidate detection step of detecting candidates for the defective portion using the captured image obtained in the imaging step;
- and
- a defective portion specifying step of specifying a portion to be detected as the defective portion from the candidates for the defective portion, and
- in the defective portion specifying step, in a case where the optical wavelength conversion sheet is irradiated from a back surface side with illumination light including the light in the first wavelength range and observed from a front surface side, a portion to be different in luminance from surrounding portions, which is determined by visual observation, is specified as the defective portion.
Dependencies are inferred from the claim text.