| 摘要 |
PURPOSE:To adjust, confirm visually and observe easily the display picture to the easy-to-use condition by providing a filter action member so as to cover the front surface side of the picture display part and adjust the easy legibility of the display picture by pulling out and holding the filter freely to the front surface side of the picture display part and storing and removing it to the storing part. CONSTITUTION:In accordance with the necessity by the condition of the brightness in the room, the outside light incident direction, etc., the first or second filter action member (filter film) F1 and F2 to make easiest the display picture on a screen 2 surface is selected, the knob piece 61 or 62 of a filter film is picked up, a filter film F1 or F2 is pulled down along the outer surface of the screen 2 against the winding energizing force of a winding roller 41 or 42, and both right and left edge parts of a crossbar 51 or 52 at the filter film lower side are respective hung and locked to the above- mentioned stopper buttons 9.9. Thus, at the total part of the front surface side of the screen 2 which is a picture display part, the first or second selected filter film F1 or F2 comes to be the extension holding condition, the front surface side of the screen 2 is covered with the film, and the display picture of the screen 2 surface is satisfactorily confirmed visually and observed through the extension holding filter film F1.
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