| 摘要 |
PURPOSE: A welding method of a thermoplastic resin panel is provided to use a structure forming a dot printed layer between two panels for an advertisement and not to decrease product value of a display device by not generating bubble between the two panels. CONSTITUTION: A smooth surface of a thermoplastic resin panel is prepared in a state in which illumination is formed in an illumination forming step of a first panel(200). A second panel(210) including a dot printed layer(205) on a surface is welded with the first panel. Plastic deformation is prevented by quick cooling in a state in which heat welding is finished in a cooling step.
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