Light irradiation apparatus

Abstract

The invention provides a light irradiation apparatus, wherein even if the line of an LED is broken, the local reducing condition of the light intensity irradiated on a processing object is inhibited. When the line of the LED is broken, the light irradiation treatment on a processing object can also be performed at a high efficiency without replacing the LED. A plurality of light-emitting portions provided with circuit substrates and a plurality of light-emitting parts formed on the circuit substrates are arranged along the plane direction. The light irradiation apparatus is characterized in that the light-emitting portions are respectively provided with an LED, a light detecting element used for detecting the light of the LED, and a by-pass element connected in parallel with the LED and conducted when the line of the LED is broken. The LEDs of the light-emitting parts of the light-emitting portions are connected in series with each other.

Description

technical field [0001] The present invention relates to a light irradiation device suitable as a light source used for laminating two translucent substrates with a photocurable sealant in a manufacturing process of a display panel such as a liquid crystal panel. Background technique [0002] In recent years, in liquid crystal panels, for the purpose of enhancing the contrast and improving the response speed, instead of the rib structure formed inside the unit cell, a PSA (Polymer Structure) that regulates the alignment direction of liquid crystal molecules by a polymer structure has been developed. Sustained Alignment) method or PSVA method. [0003] In the manufacturing process of this PSA-type liquid crystal panel, a liquid crystal material containing a photopolymerizable component is injected into the cell, and a voltage is applied to the injected liquid crystal material while irradiating ultraviolet rays, thereby performing polymerization in the cell. object structure. ...

AI Technical Summary

Problems solved by technology

Also, if one of the many LEDs is disconnected, the amount of light irradiated to the object to be processed will locally decrease.

Therefore, every time a single LED is disconnected, the LED must be replaced with a new one, which requires frequent maintenance work and reduces the operating rate of the device. As a result, it is difficult to perform light irradiation treatment efficiently.

[0014] Also, Patent Document 1 discloses a structure that adjusts the power supply amount of LEDs based on the illuminance measured by the illuminance meter, but it is a device that checks the illuminance caused by each LED before using the light irradiation device, and does not It is a device that measures the illuminance of the LED during the use of the irradiation device. Therefore, the power supply amount of the LED cannot be adjusted during the use of the light irradiation device. As a result, every time an LED is disconnected, the LED must be replaced.

Also, it is practically difficult to control the current supplied to them individually for thousands to tens of thousands of LEDs

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